Production Facility for Northern Telecom's ?
Production Facility for Northern Telecom's PULSE telephone system, one of the first PBX (Private Branch Exchange) systems to use computer software to perform basic call functions such as dial tone, hold and transfer. Northern Telecom, Palo Alto California, 1974. Photo: John G. Zimmerman Archive/Courtesy Everett Collection
Picture No
10666600
Media ID
45225465
Size
2550px x 3876px
(5.2MB)
Credit
Mary Evans / Everett Collection
Usage Restrictions
Strictly editorial use only. Please contact Mary Evans if any other use required
