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公开(公告)号：US2935218A
公开(公告)日：1960-05-03
申请号：US71918358
申请日：1958-03-03
Applicant: KEYSTONE ENGINEERING COMPANY
Inventor： FRITZ CONRAD M
CPC classification number: B60P1/02 , B66F7/0625 , B66F7/065 , B66F7/08
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