PURPOSE: To secure writing of the series of numbers as the telephone numbers or the like as well as the output display of them, by installing the nonvolatile memory which can memorize the all key input information including the "O" information before input of the hyphen and numerical information.

CONSTITUTION: The device comprises the following component units: device main body 1; cover part 2 containing memory paper 3; keyboard part 4 possessing memory address number designation key NO, memory input key NI and others; indicator 5 of 12 digits; mode switch 6 which performs switching between modes W and R to supply and deliver the data to/from the nonvolatile memory; automatic power switch 7 which is turned on with open of cover 2; and others. To memorize the telephone numbers into the memory, the hyphen (-) key is provided to give an indentification between the toll number, the local number and the telephone number respectively. Thus, 0, 6, -, 6, 2, 1, -, 1, 2, 2 and 1 are pushed to secure the display of 06-621-1221 (a) as well as to memorize the number into the momory. In the case of the name code, display (c) shows the name code of 12345 with joining the company in 1977