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公开(公告)号：US1783355A
公开(公告)日：1930-12-02
申请号：US20911727
申请日：1927-07-28
Applicant: RISLER CORP OF AMERICA
Inventor： LEON CHARDARD JEAN BAPTISTE DO
IPC: F28D7/00
CPC classification number: F28D7/00 , Y10S165/439
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