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1.Method of and apparatus for determining characteristics of surfaces 失效
Title translation: 用于确定表面特性的方法和装置公开(公告)号:US2315282A
公开(公告)日:1943-03-30
申请号:US30053439
申请日:1939-10-21
Applicant: SNOW HAROLD A
Inventor: SNOW HAROLD A
IPC: G01N21/55
CPC classification number: G01N21/55
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公开(公告)号:US2240722A
公开(公告)日:1941-05-06
申请号:US20005438
申请日:1938-04-04
Applicant: SNOW HAROLD A
Inventor: SNOW HAROLD A
IPC: G01J3/46
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