1938
1940

1939

“Defective” Clear 302 By Ray Kotke
“Defective” Clear 302 By Ray Kotke
Western Electric
AE 40
AE 40
Automatic Electric
AE40 With Gold Leaf And Butler Handle
AE40 With Gold Leaf And Butler Handle
Automatic Electric
Australian PMG 300 Series Wall Phone
Australian PMG 300 Series Wall Phone
Green AE40 With Gold Trim
Green AE40 With Gold Trim
Automatic Electric
Red AE40 With Gold Trim
Red AE40 With Gold Trim
Automatic Electric
Reproduction Clear AE 40
Reproduction Clear AE 40
Automatic Electric
p-n junction (transistor/solar precursor) invented at Bell Labs
Russell Ohl
PDF: AE 1939 Private Telephone Systems catalog
AE 1939 Private Telephone Systems catalog
Ad: 'Big in value'
'Big in value'
Photo: Operators at 1939 World's Fair
Operators at 1939 World's Fair
Video: The Voder - Homer Dudley (Bell Labs) 1939
The Voder - Homer Dudley (Bell Labs) 1939
PDF: AT&T Annual Report, 1939
AT&T Annual Report, 1939
Ad: Conference Telephone Service
Conference Telephone Service
PDF: Ericsson 1939 catalog
Ericsson 1939 catalog
PDF: From The Far Corners of the Earth
From The Far Corners of the Earth
PDF: The Crossbar System Bell Labs
The Crossbar System Bell Labs