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发明名称
Method for welding rails
摘要
申请公布号
US2250870(A)
申请公布日期
1941.07.29
申请号
US19400369772
申请日期
1940.12.12
申请人
SPERRY PRODUCTS, INC.
发明人
JONES GEORGE LESTER;ROEDE CHARLES B.
分类号
E01B11/50
主分类号
E01B11/50
代理机构
代理人
主权项
地址
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