1926
1928

1927

Fuld ‘Bauhaus’ Phone
Fuld ‘Bauhaus’ Phone
H. Fuld & Co./TN
WE 100-Type Phone With "French" E1 Handset
WE 100-Type Phone With "French" E1 Handset
Western Electric
WE 551 Switchboard
WE 551 Switchboard
Western Electric
WE Model 102
WE Model 102
Western Electric
Davisson–Germer experiment confirms wave particle duality of matter
Clinton Davisson Lester Germer
PDF: A Historical View of the San Francisco Exchange
A Historical View of the San Francisco Exchange
Ad: Fuld phone
Fuld phone
Photo: New York Telephone building at 140 West Street
New York Telephone building at 140 West Street
First long-distance video transmission over copper (with Herbert Hoover)
First long-distance video transmission over copper (with Herbert Hoover)
PDF: AT&T Annual Report, 1927
AT&T Annual Report, 1927
First transatlantic phone calls, using radio signals
First transatlantic phone calls, using radio signals
PDF: NE 1927 catalog
NE 1927 catalog
Black invents the negative feedback amplifier
Harold Stephen Black