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公开(公告)号：US993311A
公开(公告)日：1911-05-23
申请号：US1909514403
申请日：1909-08-24
Applicant: FRANK W SMITH , JOSEPH G SWALLOW , MCCOY WALTER E
Inventor： MCCOY WALTER E
CPC classification number: G01R35/04
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