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公开(公告)号：US1910498A
公开(公告)日：1933-05-23
申请号：US51231231
申请日：1931-01-30
Applicant: SERVEL INC
Inventor： EDWARD PLOEGER CLYDE , BURGESS ALVIN E , KUENZLI WALTER A
CPC classification number: F25B31/02 , F25B1/04 , Y10S417/902
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