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公开(公告)号：US3545719A
公开(公告)日：1970-12-08
申请号：US3545719D
申请日：1967-12-26
Applicant: BABSON BROS CO
Inventor： SHULICK ROBERT J , STACHOWSKI RAYMOND
CPC classification number: A01J5/044 , F16K51/00 , Y10T137/6137
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