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1.发明授权
公开(公告)号：US3462283A
公开(公告)日：1969-08-19
申请号：US3462283D
申请日：1967-02-28
Applicant: PENOCK & FORD LTD
Inventor： HIERMSTAD ERLING T , MARTIN LARRY C , KIRBY KENNETH W
CPC classification number: D21H19/54 , C03C25/321 , C08B31/10
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