1926
1928
Fuld ‘Bauhaus’ Phone
WE 100-Type Phone With "French" E1 Handset
WE 551 Switchboard
WE Model 102
First transatlantic phone calls, using radio signals
PDF:
A Historical View of the San Francisco Exchange
Ad: Fuld phone
Photo: New York Telephone building at 140 West Street
Black invents the negative feedback amplifier
PDF:
AT&T Annual Report, 1927
PDF:
NE 1927 catalog
