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公开(公告)号：US2777458A
公开(公告)日：1957-01-15
申请号：US45309154
申请日：1954-08-30
Applicant: SPECIALTIES DEV CORP
Inventor： STERN GEORGE T
IPC: G05D16/10
CPC classification number: G05D16/10 , Y10T137/261 , Y10T137/7792 , Y10T137/7801
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