T.H. Trenholm 
Last updated: 20.02.17
All that can presently (May 2013) be gleaned about by internet searching is that T.H. Trenholm is the one-off composer of Auto Rag (1905) published by T.H. Trenholm, , USA.
Surfers are welcome to contribute information about this composer.
CDs :
Ragtime Music CDs:
cd15.gif "Perfessor" Bill Edwards on "T-Model Tunes"