Telephone model from 1975.The first telephones for tone signalling of numbers were put to use in 1975 in areas with computerised telephone exchanges. The principle behind tone signalling is that each digit
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Telephone - Wikipedia
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Telephone Model 312F | Science Museum Group Collection
![Telephone design: A brief history. [PHOTOS]](http://www.slate.com/content/dam/slideshows/life/design/2012/05/14/hello-a-visual-history-of-the-phone/jcr%3Acontent/slideshow/4/images%252Fslides%252Fphone05_westernelectric.jpg "Telephone design: A brief history. [PHOTOS]")
Telephone design: A brief history. [PHOTOS]
Telephone, Model No. 302 | Yale University Art Gallery
General Electric Telephone Model 162F | Science Museum Group Collection
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Thomas Collector's Edition Telephone Model: 1929 | eBay
Telephone
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Wall telephone model 711F | Science Museum Group Collection
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Telephone - Wikipedia
SIEMENS BROTHERS No. 312
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