I just scanned this interesting little pamphlet - http://www.navy-radio.com/manuals/commsec-1943.pdf Cheers, Nick England K4NYW www.navy-radio.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20171019/03dd1e13/attachment-0001.html>