| 摘要 |
FIELD: automatic recording devices. SUBSTANCE: device has flip-flop 1, NOR gates 2, 3, reversing counter 4, comparator 5, AND gate 6, read-out moment sensor 9. Device is periodically subjected to serviceability check upon its reset in response to signal coming from read-out moment sensor. EFFECT: improved reliability and accuracy of desired displacement follow-up. 1 dwgn
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