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公开(公告)号：US3131275A
公开(公告)日：1964-04-28
申请号：US10247061
申请日：1961-04-12
Applicant: SPECIALTIES DEV CORP
Inventor： ZIMMERMAN JR CHARLES E , RUDOLPH WALZ
CPC classification number: G01K5/465 , H01H35/242
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