Patent search ap:("COLLINS RADIO CO") AND inv:"HESTON JOHN L" Page 1

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发明授权
Positive-negative counting device 失效
Title translation: 正负计数器

公开(公告)号：US2813679A

公开(公告)日：1957-11-19

申请号：US37032353

申请日：1953-07-27

Applicant: COLLINS RADIO CO

Inventor： HESTON JOHN L

IPC: G06M1/22 , G06M3/04

CPC classification number: G06M1/22 , G06M3/043

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