[GreenKeys] RCA teleprinter ad on EBAY 381052171359 trans-atlantic

[Jim Haynes]

Back in the 1930s John Moore of RCA Communications devised a teleprinter
code using a 3-out-of-7 bit selection, permitting error detection.  Later
on there was developed a system for automatically requesting 
retransmission of errored material.

John B. Moore "Constant-Ratio Code and Automatic-RQ on Transoceanic HF 
Radio Services." IRE Transactions on Communications Systems, March 1960, 
p. 72.

The system has some similarities to present-day AMTOR-SITOR

Several years ago there was on ebay a tape punch like the Teletype GPE but
punched 7-level code and had an RCA nameplate on it.  Reasonable guess
that Teletype made them for RCA and that it punched Moore code.

jhhaynes at earthlink dot net