Ruckstell and Truckstell - related?

My curiosity has me finding out that in the fifties Chevrolet owners were offered an overdrive unit to instal in their enclosed driveline:



This was a Truckstell overdrive unit. Somewhere or other I also came across a picture of a chromed badge on a bootlid.

Further back, however, Ruckstell made bits for T-models (and likely A-models etc) and among their offerings was a similar overdrive unit.

Is there a relationship between the two makers? Did one come from the ashes of another, for instance?

Does anyone know about these obscure things?

Oh yeah, I have no pics of the Ruckstell because the internet is too full of their 2-speed rear ends...

And it seems there's a lot of interest among owners of these old cars, both Chevrolet and Ford, for there to be a lot of internet discussion about using overdrives to enable them to keep up with modern traffic.