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发明名称
Manhole cover
摘要
申请公布号
US2006937(A)
申请公布日期
1935.07.02
申请号
US19340719693
申请日期
1934.04.09
申请人
GAR WOOD INDUSTRIES, INC.
发明人
BARRETT EDWARD R.
分类号
F16J13/20
主分类号
F16J13/20
代理机构
代理人
主权项
地址
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