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公开(公告)号：CA468815A
公开(公告)日：1950-10-17
申请号：CA468815D
Applicant: KEYSTONE ENGINEERING COMPANY
Inventor： MARION ALEXANDER G
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公开(公告)号：US2521385A
公开(公告)日：1950-09-05
申请号：US68029946
申请日：1946-06-28
Applicant: KEYSTONE ENGINEERING COMPANY
Inventor： MARION ALEXANDER G
IPC: B26D3/16
CPC classification number: B26D3/16 , Y10S29/059 , Y10T82/16819 , Y10T82/16868 , Y10T82/16951 , Y10T82/16967
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