O.W.Brenizer c1907 (867,697).... and T.M.Thorson c1906 (pat. 815,879) were both from Philadelphia and both held single trigger patents...those could be likely candidates....and I know that you already know, that we know next to nothing about Alfred Worrest's early career and very little about the Fox skilled laborers.....
Is there a trigger or just a printed reference?