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公开(公告)号：US1915618A
公开(公告)日：1933-06-27
申请号：US54166331
申请日：1931-06-02
Applicant: STANDARD IG CO
Inventor： RALSTON ANDERSON W , WRIGHT JAMES R
IPC: B01J38/00
CPC classification number: B01J38/00
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