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发明名称
Ballast element
摘要
申请公布号
US3185255(A)
申请公布日期
1965.05.25
申请号
US19600045433
申请日期
1960.07.26
申请人
BIRD MERRILL S
发明人
BIRD MERRILL S.
分类号
D06F37/20;D06F37/26;F16F15/28
主分类号
D06F37/20
代理机构
代理人
主权项
地址
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