GENERAL STATEMENT OF THE CLASS SUBJECT MATTERThis is the generic class for
(a) originating or emitting a coded set of discrete signals or
(b) translating one code into another code wherein the information signal content remains the same but the formats may differ. For classification herein, at least one of the codes must be a set of pulses or digits and electrical in nature.
LINES WITH OTHER CLASSESExcluded from this class is analog to analog conversion. See References to Other Classes, below, for examples of other classes containing this subject matter.
Included in this class (341) is subject matter relating to codes, per se, such as Morse codes, grey codes. Excluded from this class are coded records and coded record readers. See References to Other Classes, below,Combinations of an optically encoded shaft wheel and a photocell absent any signal processing circuitry are classified elsewhere. See References to Other Classes, below.
Code converters which may be utilized in pulse or digital communication systems, Class 375, are classified in this class (341).
A. The combination of the subject matter of this class (341) and another art environment is generally classified with the art device where the environment is significant by virtue of the claimed relationship. For example:Coding and decoding for cryptographyCoding and decoding for error detection or correctionCode transmitters specific to telemetry.
Data compression and expansionMicrowave devices.
Radiowave beacons.
Radar generation, conversion or systemsB. Pulse generation or conversion which is not unique to communications are classified in the appropriate classes. For example:Pulse demodulation, per se.
Pulse generation.
Pulse modulation, per sePulse wave conversion systems; i.e., sine wave to pulse waveSee References to Other Classes, below, for appropriate class references.
This class is structured into 14 main divisions. See Subclass References to the Current Class, below. |
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1 • DIGITAL PATTERN READING TYPE CONVERTER
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2 • Plural denominationally related carriers (e.g., coarse/fine geared discs)
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3 • Plural types of codes on single carrier
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4 • According to nonlinear function
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5 • For X or Y coordinate determination (e.g., stylus-pad)
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6 • With directional discrimination
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7 • Antiambiguity feature
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8 • Real and complementary patterns
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9 • Having combined (e.g., denominational, combination code) coding pattern
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10 • Constant distance code
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11 • Incremental
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12 • Cathode ray
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13 • Optical
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14 • Having optical waveguide
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15 • Magnetic, inductive or capacitive
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16 • Brush and contacts or conductive pattern
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17 • Actuated by physical projection
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20 • BODILY ACTUATED CODE GENERATOR
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21 • For handicapped user
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22 • Including keyboard or keypad
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23 • Variable key legends
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24 • With error prevention means (e.g., debounce, antichatter)
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25 • With rollover feature (i.e., antidoublestrike)
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26 • With particular key scanning feature
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27 • With audible or tactile indicator
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28 • For pictorial or ideographic characters (e.g., design, chinese or japanese characters)
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29 • With variable pulse spacing or grouping
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30 • For numerical pulse type transmission
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31 • Photoelectric actuation
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32 • Magnetic or inductive actuation
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33 • Capacitive actuation
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34 • Pressure sensitive actuation
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35 • With rotary dial
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50 • DIGITAL CODE TO DIGITAL CODE CONVERTERS
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51 • Adaptive coding
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52 • To or from particular bit symbol
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53 • Bit represented by pulse width
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54 • Bit represented by discrete frequency
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55 • Substituting specified bit combinations for other prescribed bit combinations
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56 • To or from multi-level codes
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57 • Binary to or from ternary
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58 • To or from minimum d.clevel codes
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59 • To or from run length limited codes
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60 • To or from packed format
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61 • Data rate conversion
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62 • BCD (binary-coded-decimal) to or from decimal
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63 • To or from bit count codes
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64 • To or from number of pulses
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65 • To or from Huffman codes
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66 • To or from Morse code
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67 • To or from variable length codes
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68 • To or from NRZ (nonreturn-to-zero) codes
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69 • Return-to-zero to or from NRZ (nonreturn-to-zero) codes
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70 • To or from bi-phase level code (e.g., split phase code, Manchester code)
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71 • To or from bi-phase space or mark codes (e.g., double frequency code, FM code)
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72 • To or from delay modulation code (e.g., Miller code, three frequency code, MFM code)
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73 • To or from coded mark inversion
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74 • To or from double density code
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75 • To or from nonlinear codes
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76 • To or from differential codes
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77 • To or from delta modulation codes
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78 • Programmable structure
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79 • Tree structure
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80 • To or from fibonacci codes
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81 • To or from interleaved format
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82 • To or from mixed code formats
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83 • To or from mixed base codes
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84 • Binary to BCD (binary-coded decimal)
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85 • BCD (binary-coded decimal) to binary
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86 • Generator runs until new code is generated
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87 • Unnecessary data suppression
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88 • Multiple conversions using same converter
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89 • Reversible converters
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90 • To or from alphanumeric code formats
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91 • To or from Baudot code
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92 • To or from Hollerith code
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93 • Complementers
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94 • With error detection or correction
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95 • Byte length changed
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96 • To or from constant distance codes
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97 • Gray to binary
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98 • Binary to Gray
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99 • To or from display device codes
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100 • Serial to parallel
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101 • Parallel to serial
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102 • To or from "N" out of "M" codes
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103 • "N" out of "M" to "X" out of "Y"
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104 • Binary to decimal
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105 • Decimal to binary
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106 • Coding by table look-up techniques
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107 • To or from code based on probability
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108 • REVERSIBLE ANALOG TO DIGITAL CONVERTERS
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109 • STOCHASTIC TECHNIQUES
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110 • ANALOG TO DIGITAL CONVERSION FOLLOWED BY DIGITAL TO ANALOG CONVERSION
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111 • PHASE OR TIME OF PHASE CHANGE
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112 • Synchro or resolver signal
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113 • Coarse and fine
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114 • Control system
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115 • Converter compensation
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116 • Analog resolver or synchro signal to digital signal
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117 • Digital signal to analog resolver or synchro signal
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118 • CONVERTER COMPENSATION
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119 • Temperature compensation
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120 • CONVERTER CALIBRATION OR TESTING
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121 • Trimming control circuits
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122 • SAMPLE AND HOLD
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123 • Having variable sampling rate
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124 • Sampled and held input signal with linear return to datum
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125 • Sampled and held input signal with nonlinear return to datum
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126 • ANALOG TO OR FROM DIGITAL CONVERSION
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127 • Bipolar
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128 • Dual slope analog to digital converter
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129 • Plural slope analog to digital converter
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130 • Difunction code as output
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131 • Increasing converter resolution (e.g., dithering)
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132 • Detecting analog signal peak
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133 • With particular solid state devices (e.g., Gunn effect device, Josephson device, drift transistor, using solid state active devices as impedances) with other at longer intervals)
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134 • Integrated injection logic
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135 • Current mirror
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136 • Field effect transistor
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137 • Using optical device, (e.g., fiber optics, cathode ray tubes)
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138 • Nonlinear
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139 • Automatic control for increasing converter range (e.g., gain ranging, automatic gain control)
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140 • Linearization (e.g., nonlinear transfer characteristic compensates for nonlinear transducer)
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141 • Multiplex
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142 • Converter is part of control loop
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143 • Differential encoder and/or decoder (e.g., delta modulation, differential pulse code modulation)
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144 • Digital to analog conversion
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145 • Coarse and fine conversions
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146 • Serial conversion
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147 • Function generator
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148 • Tree structure
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149 • Using magnetic or cryogenic components
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150 • Using charge coupled devices or switched capacitances
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151 • Analog output represents a displacement or force
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152 • With intermediate conversion of digital value to time interval
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153 • Using weighted impedances
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154 • Using ladder network
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155 • Analog to digital conversion
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156 • Coarse and fine conversions
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157 • Intermediate conversion to frequency or number of pulses
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158 • Analog input compared with static reference
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159 • Parallel type
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160 • Including priority encoder
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161 • Acting sequentially
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162 • Serial conversions with change in signal
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163 • Recirculating
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164 • Single comparator and counter
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165 • Single comparator and digital storage
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166 • Intermediate conversion to time interval
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167 • Dual slope
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168 • Plural slope
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169 • Input signal compared with linear ramp
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170 • Input signal compared with nonlinear ramp
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171 • Using magnetic or cryogenic components
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172 • Using charge transfer devices (e.g., charge coupled devices, charge transfer by switched capacitances)
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173 • CODE GENERATOR OR TRANSMITTER
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174 • Plural transmitters
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175 • With code display at transmitter
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176 • Transmitter for remote control signal
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177 • Producing different pulse frequencies
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178 • With variable pulse spacing or grouping
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179 • Plural pulse shapes
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180 • Plural channels
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181 • Carrier frequency variation
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182 • With variable pulse length
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183 • Pulse presence or absence in equal length code
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184 • Numerical pulse type
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185 • Multistage
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186 • With gaseous or space discharge device
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187 • Having counter or register
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188 • Serial pulse number actuation
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189 • Pulse gating
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190 • Mechanical switch feature
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191 • With gaseous or space discharge device feature
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192 • With rotary distributor
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200 • QUANTIZER
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899 • MISCELLANEOUS
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