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公开(公告)号：US2490716A
公开(公告)日：1949-12-06
申请号：US58559845
申请日：1945-03-30
Applicant: STALEY MFG CO A E
Inventor： SMITH CLIFFORD E , OLSON ELDRED K
IPC: C13K1/08
CPC classification number: C13K1/08
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