| 摘要 |
1,218,584. Bowling score keeping. DOBAN LABORATORIES Inc. 2 July, 1968 [4 Oct., 1967], No. 31621/68. Headings G4D and G4H. Pin-fall is detected and counted and an indication given visually of which pins are down. After a ball has been delivered photo-detectors PA1-PA4 respond to sequential pulses from a flasher generator 41 and the presence of standing pins to apply inputs through AND gates A1-A10 sequentially marked by circuits A1-A4 to corresponding stages P1-P10 of a shift register. The lower terminals carry inverse markings to print or record at 47 those pins which are down. If all pins are down AND gate
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