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经营范围
发明名称
VACUUM HEATING SYSTEM
摘要
申请公布号
CA336292(A)
申请公布日期
1933.10.10
申请号
CAD336292
申请日期
申请人
THE C. A. DUNHAM COMPANY
发明人
DAVID N. CROSTHWAIT, JR.
分类号
主分类号
代理机构
代理人
主权项
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