While cataloguing today I came across a mention of a drafting system
a google and see page 11 of
www.dtic.mil/dtic/tr/fulltext/u2/694647.pdf
What I have is in a collected articles type of book
Topics in Electronics,
microwave electronics, space technology,
avionics radar transportation, laser interferometry, automatic drafting
vol VIII 1967
http://www.collection.archivist.info/searchv13.php?searchstr=bk3270
Dave Caroline