Stuart,
About your new find, I have never heard of one, and just did some searching, very few results.

Seems they were made in CA not to long ago, and those who have them like them.

I could not find any pictures or info on the Mitchell unit.

What can you tell us about it?

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-