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1.发明授权
公开(公告)号：US2831821A
公开(公告)日：1958-04-22
申请号：US42267854
申请日：1954-04-12
Applicant: PITTSBURGH PLATE GLASS CO
Inventor： CHRISTENSON ROGER M , FERRMAN RICHARD A
IPC: C08G8/12
CPC classification number: C08G8/12
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