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1.发明授权
公开(公告)号：US3505067A
公开(公告)日：1970-04-07
申请号：US3505067D
申请日：1967-03-16
Applicant: GAF CORP
Inventor： DERSCH FRITZ , ARMENTROUT RICHARD P
CPC classification number: G03C1/053 , Y10S430/162
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