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公开(公告)号：US1744981A
公开(公告)日：1930-01-28
申请号：US18362127
申请日：1927-04-13
Applicant: NAT VULCANIZED FIBRE COMPANY
Inventor： MCCLELLAN JAMES L
IPC: C01G9/04
CPC classification number: C01G9/04
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