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公开(公告)号:US2311477A
公开(公告)日:1943-02-16
申请号:US43408142
申请日:1942-03-10
Applicant: SEMERAK WILLIAM A
Inventor: SEMERAK WILLIAM A
IPC: G01B3/18
CPC classification number: G01B3/18
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公开(公告)号:US2326571A
公开(公告)日:1943-08-10
申请号:US43408242
申请日:1942-03-10
Applicant: SEMERAK WILLIAM A
Inventor: SEMERAK WILLIAM A
IPC: G01B3/18
CPC classification number: G01B3/18
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公开(公告)号:US2289051A
公开(公告)日:1942-07-07
申请号:US39233541
申请日:1941-05-07
Applicant: SEMERAK WILLIAM A
Inventor: SEMERAK WILLIAM A
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公开(公告)号:US1162407A
公开(公告)日:1915-11-30
申请号:US1913783409
申请日:1913-08-06
Applicant: SEMERAK WILLIAM A
Inventor: SEMERAK WILLIAM A
CPC classification number: E05Y2201/684
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