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公开(公告)号：US2021464A
公开(公告)日：1935-11-19
申请号：US53364231
申请日：1931-04-29
Applicant: SERVEL INC
Inventor： RICKARD ROBERT L , COLLINS WILLIAM D
IPC: F25D25/02
CPC classification number: F25D25/02 , F25D2400/32 , Y10T74/20762
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