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公开(公告)号:US1092514A
公开(公告)日:1914-04-07
申请号:US1913799558
申请日:1913-11-06
Applicant: BELL LOUIS A
Inventor: BELL LOUIS A
CPC classification number: E04H15/50
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公开(公告)号:US2614698A
公开(公告)日:1952-10-21
申请号:US1641948
申请日:1948-03-23
Applicant: BELL LOUIS A
Inventor: BELL LOUIS A
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