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公开(公告)号：US1367837A
公开(公告)日：1921-02-08
申请号：US31622319
申请日：1919-08-08
Applicant: THOMAS SPAULDING
Inventor： THOMAS SPAULDING
IPC: E01B7/00
CPC classification number: E01B7/28 , E01B7/00 , E01B2202/024
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