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公开(公告)号：US3527308A
公开(公告)日：1970-09-08
申请号：US3527308D
申请日：1967-06-09
Applicant: GEN MOTORS CORP
Inventor： BERNOTAS RALPH J , CHEERS RONALD M , HOLUB CHARLES R
IPC: A01B13/08 , A01B63/10 , A01B63/32 , A01B63/102
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