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公开(公告)号：US2358300A
公开(公告)日：1944-09-19
申请号：US46659442
申请日：1942-11-23
Applicant: BENJAMIN
Inventor： BENJAMIN MILTON L , DREW CHARLES E
IPC: B23B31/20
CPC classification number: B23B31/202 , B23B31/201 , B23B2231/2021 , B23B2231/2091 , Y10T279/14 , Y10T279/17512
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