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公开(公告)号：US2506768A
公开(公告)日：1950-05-09
申请号：US3940848
申请日：1948-07-19
Applicant: CATERPILLAR TRACTOR CO
Inventor： BENTZ ERWIN J , FLECK KENNETH J
IPC: F23Q7/00
CPC classification number: F23Q7/001
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