Porta phone.
The Porta Phone Company is the manufacturer of Digicom, a full duplex (Computers) arranged so that the information may be transmitted in both directions simultaneously; - of communications channels between computers; contrasted with half duplex(a). wireless that allows football coaches to talk simultaneously without push-to-talk buttons. These unique two-way headsets transmit scrambled digital signals so that pressbox to sideline sideline
See on the sidelines. transmissions completely private.
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PORTA PHONE CIRCLE NO.60
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