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公开(公告)号：US2657421A
公开(公告)日：1953-11-03
申请号：US18933350
申请日：1950-10-10
Applicant: POLSON ROBERT G
Inventor： POLSON ROBERT G
IPC: E05D7/08
CPC classification number: E05D7/1005 , E05D7/0423 , E05D7/081 , E05D15/54 , E05F1/1246 , E05Y2201/638 , Y10T16/53225
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