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公开(公告)号：US1874714A
公开(公告)日：1932-08-30
申请号：US46389330
申请日：1930-06-26
Applicant: SPERRY DEV CO
Inventor： SPERRY ELMER A , PERRY WALTER M
IPC: B64C11/36
CPC classification number: B64C11/36
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