170514
 I have a Heavy 10R that my Father bought from Burnett Crystal Ice in the late 50's or early 60's. 
Burnett Crystal Ice (Texarkana, Texas) bought it through Briggs-Weaver (Dallas, Texas).
Shipping date was 4/17/1946.
My Father and I used it in his machine shop until about 1985.
I also have a South Bend 9" Workshop that he bought new in about 1938.
I'll dig out the paperwork for the 9" and send info. later.