Yes, I'm sure...
Cushman's 2, 3, and 4 wheel electric vehicles were primarily intended for use inside large manufacturing facilities, so they were not advertised to the general public, nor was any literature for these vehicles released to private individuals.
Most of the surviving examples were taken home by employees of these companies after the product's service life had ended...
A few members of my family worked in the experimental department of Cushman, and some were in the design department of the sales and service section, so we had access to prototype models that never went into production, as well as in-house test models that eventually were developed and sold...all brought home for pennies on the dollar, or free, as gifts from the company...
There are dozens of Cushman-related sites and forums...one of the best is CCOA...and there are links and info there leading to other sites...
Cushman Club of America Website
If you have a photo of a frame that can't be positively ID'd as a Cushman by someone in CCOA, the Cushman Retiree's Group meets the first Saturday of every month in Lincoln, Nebraska...they can answer any question regarding any Cushman product or prototype that didn't make it into production...
If you'd like to post a photo of your frame here, I'll take a look at it, and if I don't know what it is, I'll ask my dad (retired Cushman Sales and Service Supervisor) to have a look at it, or take it to a Retiree's meeting with him...