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公开(公告)号：US1779830A
公开(公告)日：1930-10-28
申请号：US29798528
申请日：1928-08-07
Applicant: SIMPSON WILLIAM L
Inventor： SIMPSON WILLIAM L
IPC: A01J11/12
CPC classification number: A01J11/12
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公开(公告)号：US1230933A
公开(公告)日：1917-06-26
申请号：US15860817
申请日：1917-03-30
Applicant: SIMPSON WILLIAM L
Inventor： SIMPSON WILLIAM L
CPC classification number: F42C15/24
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