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公开(公告)号：US3087993A
公开(公告)日：1963-04-30
申请号：US1621360
申请日：1960-03-21
Applicant: NORTH AMERICAN PHILLIPS COMPAN
Inventor： HURCK NICOLAAS VAN , MARIE STUMPERS FRANS LOUIS HEN
IPC: H04H20/88
CPC classification number: H04H20/88
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