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发明名称
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摘要
申请公布号
US2783682(A)
申请公布日期
1957.03.05
申请号
US19500181388
申请日期
1950.08.25
申请人
SWENSON OSCAR J
发明人
SWENSON OSCAR J.
分类号
E06B3/67;G02B1/06;G02B5/24
主分类号
E06B3/67
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代理人
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