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公开(公告)号：US1827486A
公开(公告)日：1931-10-13
申请号：US29770128
申请日：1928-08-06
Applicant: CREWS HALBERT O
Inventor： CREWS HALBERT O
IPC: E04H15/20
CPC classification number: E04H15/20 , E04H2015/201
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