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公开(公告)号：US1050694A
公开(公告)日：1913-01-14
申请号：US1907383895
申请日：1907-07-15
Applicant: ROLLER SMITH COMPANY
Inventor： ROLLER FRANK W
CPC classification number: G01R1/203
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公开(公告)号：US1032786A
公开(公告)日：1912-07-16
申请号：US1908463692
申请日：1908-11-20
Applicant: ROLLER SMITH COMPANY
Inventor： SHIRE HARRY I , BEAN HORACE D
CPC classification number: G01R5/04
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