| 摘要 |
PURPOSE:To facilitate operation by fitting a key display plate which has a hole and is given a symbol in a key part of a minicomputer stored with a program for selecting a branch line strand of an electric pole as to an electric or communication line. CONSTITUTION:Key holes 3b for alphabet keys 3a of the computer 1, key holes 4b-6b for numeric keys 4a, a decimal point key 5a, calculation instruction keys 6a, etc., and key holes 9b and 10b for a switch key 9a and a shift key 10a are bored in a plate 2 which is as long as the top surface of the minicomputer 1. Then, the display plate 17 on which kind symbols 13 for electric pole strung bodies corresponding to a computer program of strands and branch line kind symbols for a piece 14a, anchor 14b, and a pull piece 14c are entered at upper positions of rhe respective key holes of the plate 2 is placed on the top surface of the computer 1. The program is stored in the computer 1 and a key corresponding to a symbol is operated to calculate a branch line strand. |
