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发明名称
Central vacuum cleaning system
摘要
申请公布号
US2825921(A)
申请公布日期
1958.03.11
申请号
US19560566429
申请日期
1956.02.20
申请人
ARMSTRONG-DELAY, INC.
发明人
WRIGHT FRANK P.
分类号
A47L5/38;A47L9/18
主分类号
A47L5/38
代理机构
代理人
主权项
地址
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