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发明名称
Toy stethoscope with electronically simulated heartbeat
摘要
申请公布号
US3024568(A)
申请公布日期
1962.03.13
申请号
US19600013803
申请日期
1960.03.09
申请人
BARNETT HARRY E
发明人
BARNETT HARRY E.
分类号
A63H33/30
主分类号
A63H33/30
代理机构
代理人
主权项
地址
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