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apr 13, 1941 - First pushbutton telephone.
Description:
Used tones in the voice frequency range rather than pulses generated by rotary dials.
Added to timeline:
15 Dec 2019
0
0
142
Telephone
Made as an assignment for dual diploma program by Lev Levand...
Date:
apr 13, 1941
Now
~ 83 years ago
Images: