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发明名称
Switch heater
摘要
申请公布号
US1902339(A)
申请公布日期
1933.03.21
申请号
US19320601489
申请日期
1932.03.28
申请人
RUBY ERNST L
发明人
RUBY ERNST L.
分类号
E01B7/24
主分类号
E01B7/24
代理机构
代理人
主权项
地址
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