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公开(公告)号：US2748797A
公开(公告)日：1956-06-05
申请号：US25548451
申请日：1951-11-08
Applicant: SPECIALTIES DEV CORP
Inventor： HEIZER EDWARD J , AXT WALLIS C
CPC classification number: F16K17/20 , F41A7/04 , Y10T137/7613 , Y10T137/7836 , Y10T137/7848 , Y10T137/88054
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