prov:value
| - The message player unit or synthetic speech signal generator 17 may be derivable from or contain components manufactured by such companies as Texas Instruments Corp., Dallas, Tex. [using their TNC 0820 or other speech signal generating circuits]; Telesensory Systems, Inc., Palo Alto, Calif.; Vortax Division, Federal Screw Works, Troy, Mich.; Periphonics, Bohemis, N.Y.; Interstate Electronics, Inc.
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