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发明名称
Automatic commutator
摘要
申请公布号
US1834639(A)
申请公布日期
1931.12.01
申请号
US19290387475
申请日期
1929.08.21
申请人
GIOVANNI PEDRAZZO
发明人
PEDRAZZO GIOVANNI
分类号
H02P7/00
主分类号
H02P7/00
代理机构
代理人
主权项
地址
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