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公开(公告)号：US3506293A
公开(公告)日：1970-04-14
申请号：US3506293D
申请日：1968-03-01
Applicant: NORRIS INDUSTRIES
Inventor： RUSSELL FRED J , ARMSTRONG RICHARD L , FALK HAROLD W
IPC: E05B15/02
CPC classification number: E05B15/0245 , Y10T292/707
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