[GreenKeys] Teletype Code Diagram source?

[Sam Hallas]

Alf Fisher wrote:
> The 'Teletypewriter Code' table is from Freebody Chapter 1 page 10.
> Figure 2 & Figure 4 (ITA No.1 and ITA No.2) are on the previous pages.

Thanks, Alf. I'll pass the info on. I've never managed to find a copy of 
Freebody at a sensible price.
Cheers,
Sam