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公开(公告)号：US1773156A
公开(公告)日：1930-08-19
申请号：US27293928
申请日：1928-04-26
Applicant: ZOLTAN THOMKA
Inventor： ZOLTAN THOMKA
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/10
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