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公开(公告)号：US3434752A
公开(公告)日：1969-03-25
申请号：US3434752D
申请日：1967-10-23
Applicant: NORRIS INDUSTRIES
Inventor： RUSSELL FRED J , ARMSTRONG RICHARD L , SPINUZZI SAM J
CPC classification number: E05B3/003 , Y10T292/865 , Y10T292/88
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