Motorola
The First Walkie-Talkie Radio - An Affectionate Look Back in Time and Some Thoughts About the First True Fabled Walkie-Talkie - by Leonard H. Anderson, 25 June 2005. Appendix B, Appendix C. See also 
http://www.scr300.org- Introduction to the Motorola C-QUAM AM Stereo System - 1992, Scanned and contributed by Glenn Petersen. 1.6MB.
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