Patent
1977-07-06
1979-10-30
Hum, Vance Y.
35 8A, G09B 1906
Patent
active
041723295
ABSTRACT:
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.
REFERENCES:
patent: 3405238 (1968-10-01), Hurvitz
patent: 3495337 (1970-02-01), Meyer et al.
patent: 3550289 (1970-12-01), Orita et al.
patent: 3571524 (1971-03-01), Kozu et al.
patent: 3641507 (1972-02-01), Kosaka et al.
patent: 3683515 (1972-08-01), Kosaka
patent: 3702506 (1972-11-01), Goshima et al.
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