Ed, the Model 35 was NOT just for factories to put in a corner. This was used extensively on ambulances in the 1990s and 2000s before newer models came along. Before it had competitors, I'd say probably 75% or more of ambulances in the US had a Model 35.
I have to say, having used Model 30s through the 80s and 90s, when the Model 35 came along, it was a LIFESAVER....er....BACKSAVER. Anyone who actually worked on ambulances can tell you what a huge improvement this was! I no longer go home from work with an aching back like I did when we used Model 30 cots. The Model 35 was a huge improvement that helped EMTs and patients every day.
The newer stretchers are essentially just like the Model 35, but with a motor added - another improvement. Sure, there are competing brands now (Stryker), but that's business.
And we have always taught EMTs and Paramedics that there is no such thing as a "one-man" stretcher - two crew members must always move a patient, no matter what kind of stretcher.
Right now, the Model 35A is just an "old stretcher" - not new enough to be used much anymore, but not yet old enough to be an antique. In 10 years or so, it will be an antique. It's worth saving, someone will need a genuine 1990s Model 35A stretcher in a few years for their antique 1990s ambulance. This is how old stuff becomes antiques, you wait. (And yes, I have some, so in a few years, folks, you can call me.)