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公开(公告)号：US779888A
公开(公告)日：1905-01-10
申请号：US1904196473
申请日：1904-03-03
Applicant: THRATT RICHARD ALEXANDER
Inventor： THRATT RICHARD ALEXANDER
IPC: G04B37/00
CPC classification number: G04B37/005 , Y10S224/903
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公开(公告)号：US819324A
公开(公告)日：1906-05-01
申请号：US1905254817
申请日：1905-04-10
Applicant: THRATT RICHARD ALEXANDER
Inventor： THRATT RICHARD ALEXANDER
CPC classification number: A42B1/201
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