| 摘要 |
1,235,042. Keyboard encoders. SIEMENS A.G. 7 July, 1969 [8 July, 1968], No. 34108/69. Heading G4H. Each key T1-Tn energizes one line in each pair L1, L1a to L5, L5a in a complementary manner, and a detector circuit produces an error signal (NOR gates G1-G6) in the event of two simultaneously operated keys energizing both lines of one or more pairs. |
