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发明名称
Differential letter spacing for typewriters
摘要
申请公布号
US2298805(A)
申请公布日期
1942.10.13
申请号
US19390280708
申请日期
1939.06.23
申请人
RALPH C. COXHEAD CORPORATION
发明人
NORTON CHARLES W.
分类号
B41J19/32
主分类号
B41J19/32
代理机构
代理人
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地址
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