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公开(公告)号：US1666928A
公开(公告)日：1928-04-24
申请号：US51868721
申请日：1921-11-29
Applicant: EVANS MARTIN E
Inventor： EVANS MARTIN E
IPC: B21C1/10
CPC classification number: B21C1/10
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公开(公告)号：US1582454A
公开(公告)日：1926-04-27
申请号：US43510721
申请日：1921-01-05
Applicant: EVANS MARTIN E
Inventor： EVANS MARTIN E
IPC: E04H17/08
CPC classification number: E04H17/08
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