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.
Call for our FREE 24-page catalog catalog, descriptive list, on cards or in a book, of the contents of a library. Assurbanipal's library at Nineveh was cataloged on shelves of slate. The first known subject catalog was compiled by Callimachus at the Alexandrian Library in the 3d cent. B.C. . 1-800-233-1113 www.portaphone.com
PORTA PHONE CIRCLE NO.60
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