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公开(公告)号：US2907048A
公开(公告)日：1959-10-06
申请号：US66868957
申请日：1957-06-28
Applicant: THELMA GOULD
Inventor： THELMA GOULD
IPC: E03C1/01
CPC classification number: E03C1/01 , E03C2201/90
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