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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. Northern Telecom. Palo Alto California, 1974. Photo by John G. Zimmerman.
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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. Northern Telecom. Palo Alto California, 1974. Photo by John G. Zimmerman.