发明名称 |
Multi-function tape recorder having automatic timing and signalling system for training purpose |
摘要 |
A tape recorder for instructional purposes comprises a timing and signalling circuit which responds to the giving of instruction by illuminating an LED on termination of the instruction for a period equal to the duration of the interval between commencement of the instruction and illumination of the LED.
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申请公布号 |
US4172329(A) |
申请公布日期 |
1979.10.30 |
申请号 |
US19770813373 |
申请日期 |
1977.07.06 |
申请人 |
CHEN, SHIH-CHIAO |
发明人 |
CHEN, SHIH-CHIAO |
分类号 |
G09B5/04;G09B19/06;(IPC1-7):G09B19/06 |
主分类号 |
G09B5/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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