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公开(公告)号：US1814274A
公开(公告)日：1931-07-14
申请号：US31660728
申请日：1928-11-01
Applicant: WILLIAMSON FLOYD M
Inventor： WILLIAMSON FLOYD M
IPC: B21D28/34
CPC classification number: B21D28/34 , Y10T279/17786
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公开(公告)号：US1709965A
公开(公告)日：1929-04-23
申请号：US10734226
申请日：1926-05-07
Applicant: WILLIAMSON FLOYD M
Inventor： WILLIAMSON FLOYD M
IPC: F16B39/04
CPC classification number: F16B39/04
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