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1.发明授权
公开(公告)号：US3410648A
公开(公告)日：1968-11-12
申请号：US46488765
申请日：1965-05-10
Applicant: GAF CORP
Inventor： MAUTNER HENRY R , FICKERT WILLIAM L
CPC classification number: D06P1/6495 , D06P1/6135 , D06P1/645 , D06P5/138 , Y10S8/907 , Y10S8/924
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