Note
QST, Feb 1931, p. 90.
QST, May 1931, p. 81.
QST, Sep 1944, p. 117.
QST, Nov 1948, p. 122.
QST, Mar 1952, p. 112.
QST, Feb 1954, p. 115.
QST, Feb 1955, p. 135.
QST, Oct 1958, p. 180.
QST, Jan 1960, p. 146.
Candler offered a course on learning code which included a sending machine the looks very much like that sold by Teleplex and Instructograph.
References
"Some Important Hints in Learning the Code" Radio News, Feb 1933, p. 468. (and article by Walter H. Candler)