. Bell telephone magazine . oautomatically dial the number. No accesso-ries such as cards or a separate dial fornumber recording are needed since the Call-a-Matlc set houses all its features in a singleunit. And, in addition to Its capacious mem-ory, the Calla-Matic telephone features sixbuttons for additional lines and holding, aswell as optional speakerphone service. I TD-3 I H TD-3 Microwave, the latest Bell Sys-tem microwave transmission system,Is being manufactured by Western Electricfor field trial this spring. The new systemwill double the message capacity of thepresent TD-2 Microwave—c
. Bell telephone magazine . oautomatically dial the number. No accesso-ries such as cards or a separate dial fornumber recording are needed since the Call-a-Matlc set houses all its features in a singleunit. And, in addition to Its capacious mem-ory, the Calla-Matic telephone features sixbuttons for additional lines and holding, aswell as optional speakerphone service. I TD-3 I H TD-3 Microwave, the latest Bell Sys-tem microwave transmission system,Is being manufactured by Western Electricfor field trial this spring. The new systemwill double the message capacity of thepresent TD-2 Microwave—currently thebackbone of the Bell Systems long distancemicrowave communications. Employing tran-sistors and other solid state devices, TD-3will supplement, and In some cases replace,the older system throughout the UnitedStates. Each TD-3 system will provide tenworking channels and two protection chan-nels In both directions, with each broad-band channel capable of transmitting 1,200simultaneous telephone conversations—as.
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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922
