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公开(公告)号：US2092753A
公开(公告)日：1937-09-14
申请号：US64218232
申请日：1932-11-11
Applicant: HOWARD D COLMAN
Inventor： DEWEY RITCHIE P
IPC: G05D23/275
CPC classification number: G05D23/2754
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公开(公告)号：US1966336A
公开(公告)日：1934-07-10
申请号：US46486730
申请日：1930-06-30
Applicant: HOWARD D COLMAN
Inventor： DEWEY RITCHIE P
IPC: G05D23/275
CPC classification number: G05D23/275 , G05D23/1909 , Y10T74/18296
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