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公开(公告)号：US1535582A
公开(公告)日：1925-04-28
申请号：US72432324
申请日：1924-07-05
Applicant: EUGENE M FARNHAM
Inventor： DARRELL JOHN J
IPC: G08B15/00
CPC classification number: G08B15/00
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公开(公告)号：US1525722A
公开(公告)日：1925-02-10
申请号：US68719724
申请日：1924-01-19
Applicant: EUGENE M FARNHAM
Inventor： DARRELL JOHN J
IPC: B63B45/00
CPC classification number: B63B45/00 , B63B45/04 , B63B2201/08
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