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公开(公告)号：US2879142A
公开(公告)日：1959-03-24
申请号：US53560255
申请日：1955-09-21
Applicant: MINE SAFETY APPLIANCES CO
Inventor： JONES CLARENCE I , MORRIS ROBERT A
IPC: G01N27/16
CPC classification number: G01N27/16
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