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发明名称
Clearance indicator
摘要
申请公布号
US2569529(A)
申请公布日期
1951.10.02
申请号
US19500147048
申请日期
1950.03.01
申请人
LEVERING KIRK RALPH
发明人
KIRK RALPH LEVERING
分类号
E04H6/42
主分类号
E04H6/42
代理机构
代理人
主权项
地址
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