BID 860 was a small crypto unit that was used in British tanks. It operated from a 28v d.c. power source and was one of the first cryptos to have BITE (Built In Test Equipment).
This was a teleprinter with a built in crypto box. Siemens made the teleprinter and Philips the crypto.
1) Mark Corder <mark.corder(at)btinternet.com>
2) Walter Anderson <Walter.Anderson(at)uk.fujitsu.com>]