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公开(公告)号：US2986523A
公开(公告)日：1961-05-30
申请号：US65652957
申请日：1957-05-02
Applicant: PHILIPS CORP
Inventor： DER BURGT CORNELIS MARTINUS VA , FREDERIK GUGELOT JOHAN
IPC: C04B35/26
CPC classification number: C04B35/2616
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