Patents
- US patent 174465, A. G. Bell, "Telegraph", issued 1876-03-07
- US patent 775337, ROBERTO LANDELL DE MOTYRA, "WIRELESS TELEPHONE", issued 1904-11-22
- US patent 3449750, G. H. Sweigert, "Duplex Radio Communication and Signalling Appartus", issued 1969-06-10
- Patents Link
Read more about this topic: Cordless Telephone