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发明名称
Step-by-step mechanism
摘要
申请公布号
US2251645(A)
申请公布日期
1941.08.05
申请号
US19380204940
申请日期
1938.04.29
申请人
WILLIAMS OIL-O-MATIC HEATING CORPORATION
发明人
TRIMBLE ROY LANE
分类号
G07F11/50
主分类号
G07F11/50
代理机构
代理人
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