11-09-2016, 06:04 PM
Russ, I posted some info (in the comments section) on the fellow who signed the chassis, Walter Albert Spivak, on your blog page. It turns out he became the Chief Engineer for North American and was involved with production of the XB-70 bomber (and probably quite a few other things.) In 1928-29 he was at the University of Minnesota and in August was probably working a summer job at the Northland radio plant in Minneapolis.