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Patent Searching and Data


Title:
TAPE MEASURE WITH TELEPHONIC COMMUNICATION EQUIPMENT
Document Type and Number:
Japanese Patent JPS5621001
Kind Code:
A
Abstract:

PURPOSE: To simplify a construction and reduce a cost, by connecting transmitter- receivers to each other through a metal-made measuring tape and the ground as a telephone communication line.

CONSTITUTION: A pair of transmitter-receivers 1, 1' can be used for talk transmission and reception by changing over the input/output circuits of amplifiers through changeover switches 2, 2'. After power switches 3, 3' are closed, the changeover switches 2, 2' are operated on both the transmitter-receivers 1, 1' so that a talk transmission and its reception can be alternately effected through a metal-made measuring tape 7 and the ground as a telephone communication line.


Inventors:
UEDA AKIRA
Application Number:
JP1979000097144
Publication Date:
February 27, 1981
Filing Date:
July 28, 1979
Export Citation:
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Assignee:
YAMAYO SOKUTEIKI KK
International Classes:
G01B3/10; H04B13/00; (IPC1-7): G01B3/10; H04B13/00