发明名称 |
Ring for a manhole cover |
摘要 |
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申请公布号 |
USD319883(S1) |
申请公布日期 |
1991.09.10 |
申请号 |
US07/257029 |
申请日期 |
1988.10.12 |
申请人 |
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发明人 |
|
分类号 |
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主分类号 |
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代理机构 |
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代理人 |
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主权项 |
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地址 |
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