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公开(公告)号：US2875771A
公开(公告)日：1959-03-03
申请号：US55988156
申请日：1956-01-18
Applicant: BREWIN GLENDON C
Inventor： BREWIN GLENDON C
CPC classification number: E04H15/324 , E04H15/20 , E04H2015/201 , E04H2015/208
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