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公开(公告)号：US1852239A
公开(公告)日：1932-04-05
申请号：US46740630
申请日：1930-07-12
Applicant: HENDERSON CHARLES B
Inventor： HENDERSON CHARLES B
IPC: E04H15/32
CPC classification number: E04H15/324
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公开(公告)号：US904326A
公开(公告)日：1908-11-17
申请号：US1908414122
申请日：1908-02-03
Applicant: HENDERSON CHARLES B
Inventor： HENDERSON CHARLES B
CPC classification number: A01B35/14
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