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公开(公告)号：US3531691A
公开(公告)日：1970-09-29
申请号：US3531691D
申请日：1968-02-23
Applicant: VMC IND INC
Inventor： SITLER DONALD D , CHRISTIANSON WILLIAM O
CPC classification number: F42C11/00 , F42C11/008 , F42D1/05
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