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经营范围
发明名称
Vent means to vary buoyancy of a flush valve
摘要
申请公布号
US3165756(A)
申请公布日期
1965.01.19
申请号
US19620244214
申请日期
1962.12.12
申请人
SIMPSON ROBERT L
发明人
SIMPSON ROBERT L.
分类号
E03D1/34
主分类号
E03D1/34
代理机构
代理人
主权项
地址
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