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公开(公告)号：US1828922A
公开(公告)日：1931-10-27
申请号：US37795829
申请日：1929-07-13
Applicant: MORGAN CONSTRUCTION CO
Inventor： CARROLL WILLIAM E
IPC: B21C47/26
CPC classification number: B21C47/26
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公开(公告)号：US1465730A
公开(公告)日：1923-08-21
申请号：US54303222
申请日：1922-03-11
Applicant: MORGAN CONSTRUCTION CO
Inventor： GEORGE JEROME R , CARROLL WILLIAM E
IPC: B21C3/14
CPC classification number: B21C3/14
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