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发明名称
Plunger-type electric bell
摘要
申请公布号
US1769312(A)
申请公布日期
1930.07.01
申请号
US19280272004
申请日期
1928.04.23
申请人
ROLLINSON EARL H
发明人
ROLLINSON EARL H.
分类号
G10K1/064
主分类号
G10K1/064
代理机构
代理人
主权项
地址
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