Production Facility for Northern Telecom's PULSE telephone system, one of the first PBX (Private Branch Exchange) systems to ...
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
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