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公开(公告)号：US2949274A
公开(公告)日：1960-08-16
申请号：US56805356
申请日：1956-02-27
Applicant: SPECIALTIES DEV CORP
Inventor： HEIGIS HENRY E , THEODORE KALISHER
IPC: F16K31/46
CPC classification number: F16K31/465 , Y10T24/39 , Y10T74/11 , Y10T74/1892 , Y10T74/2045 , Y10T74/20636
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