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公开(公告)号：US2202947A
公开(公告)日：1940-06-04
申请号：US20069838
申请日：1938-04-07
Applicant: ST REGIS PAPER CO
Inventor： DORRINGTON NEILL E , CULLOM GEORGE A
IPC: G01G21/00
CPC classification number: G01G21/00
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