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11.发明授权
公开(公告)号：US1838547A
公开(公告)日：1931-12-29
申请号：US37362529
申请日：1929-06-25
Applicant: STANDARD IG CO
Inventor： HASLAM ROBERT T , YOUNG PHILIP L
IPC: C10G1/00
CPC classification number: C10G1/002
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