| 摘要 |
PROBLEM TO BE SOLVED: To provide a numerical input device comprising a push button switch having extreme versatility, which allows a sight disabled person and a healthy person who does not understand braille to easily operate.SOLUTION: The numerical input device comprises push button switches corresponding to at least numbers of 1-9, the nine push button switches corresponding to numbers of 1-9 are arranged by arranging 3 columns and 3 rows, and numerical identification projections are provided on a center and/or a corner of four corners of a depression face of each push button switch.SELECTED DRAWING: Figure 1 |
