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公开(公告)号：US1950140A
公开(公告)日：1934-03-06
申请号：US43378230
申请日：1930-09-23
Applicant: GRAY PROCESSES CORP
Inventor： MCDOWELL GRAY ALANSON
IPC: C10G50/00
CPC classification number: C10G50/00
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