UNfound:

The Xcel Standard Word Writing Typewriter was a syllable writing machine invented ca.1922 by Weseley H. Bennington of Kansas City, Missouri. Aside from having the entire alphabet, the keyboard of this typewriter was also able to print 22 of the most frequently used words in the English lexicon with just one key. The Excel would have been produced by the Xcel Typewriter Corporation of New York. 

Have some info about this typewriter? Have you found it? If yes, please email me at Antikey.Chop@gmail.com