Hi: I'm working on a web page about Radiosondes and would like a copy of the Viz schematic. Could it be send direct to me at: brooke at pacific.net Some patents listed with links, mostly before 1955 so tube type. http://www.prc68.com/I/Radiosonde.html -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html