Part of a crypto system - one document referred to it as a Teletype Type 58 http://www.navy-radio.com/crypto/tt36-gga1-5303-01.jpg cheers Nick England K4NYW www.navy-radio.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20180614/2f34d862/attachment.html>