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公开(公告)号：US3505112A
公开(公告)日：1970-04-07
申请号：US3505112D
申请日：1967-09-05
Applicant: RODDY E KETTLER
Inventor： KETTLER RODDY E
CPC classification number: C04B41/5315 , C04B41/5014 , C04B41/5012
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