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公开(公告)号:US3013156A
公开(公告)日:1961-12-12
申请号:US71044458
申请日:1958-01-22
Applicant: DRESSER IND
Inventor: HEARN DANIEL P
IPC: G01V5/04 , H01J47/08
CPC classification number: G01V5/04 , H01J47/08