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发明名称
Railway track circuit apparatus
摘要
申请公布号
US2178287(A)
申请公布日期
1939.10.31
申请号
US19370139521
申请日期
1937.04.28
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
PFLASTERER GEORGE R.
分类号
B61L1/18
主分类号
B61L1/18
代理机构
代理人
主权项
地址
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