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经营范围
发明名称
Corundum phonograph needle and sound reproducing apparatus embodying same
摘要
申请公布号
US2577149(A)
申请公布日期
1951.12.04
申请号
US19470761812
申请日期
1947.07.18
申请人
UNION CARBIDE AND CARBON CORPORATION
发明人
PELTON JOHN F.;HART THOMAS F.
分类号
G11B3/48
主分类号
G11B3/48
代理机构
代理人
主权项
地址
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