For what it's worth:
I owned and shot Allen bows in the late 1960's and early 1970's and also owned and shot Jennings' in both indoor league and hunting situations.
Clearly, the Jennings were a more refined item. I was driving to Monett, MO in 1976 and while southhbound below Springfield, MO, glanced at the right side of the road and saw a modest garage almost AT the side of the road with a sign on its upper edge indicating it was the "home of the Allen compound bow". I stopped and spoke with Mr. Allen, who I want to recall, preferred "Harold" to his given name of Holless. He appeared to be in his early 50's, in good health, rather quiet, but very polite. He told me that he'd searched for a way to get more velocity to minimize string jumping. He volunteered nothing about the pre-patent history of the compound bow or that he was motivated by arthritis in his shoulders. Since he had been working on the bow for many years, I imagine he was in his early 40's then and probably not arthritic, as some claim.
I have a good friend in that area who was an active target and hunting archer out of Galena, KS and Joplin, MO. He said that Mr. Allen was rarely seen in archery shops or at archery related events. He has forgotten his occupation, but also visited him a couple times.
A while back I searched "compound" bows, etc. and found a reference to bows with pulleys and wheels in the 1930's in the Eastern US area. My Missouri friend recalls seeing bows with wheels on the SIDES of limbs before Allen's patent.
The lawsuit over patent royalites is public information and so would be the patent application, which should include related historical details on any earlier bows of that type. The family had several that were parties to the lawsuit so maybe one or more can enlighten us further.
Regards,
Kevin