24 cars blue sky: Junkyard Find: Old Truck Door Signs of Colorado

I found a nice assortment of truck door signs of the 1930s through 1960s at this old-school wrecking yard north of Denver last year, and I just had to shoot a few more at this yard south of Denver last week, while picking up my '41 Plymouth project. The Colorado sun is hard on paint, but I was able to find some legible old signs.
I wonder what the Men In White did. House painting? Moving? Surgery? The seven-digit alphanumeric telephone number suggests that we're looking at a truck that was retired no later than the mid-1960s.
It appears that this is the door from a Ritz Cab Company taxi, though it's tough to read the first word. 1947 Chevrolet? 1946 DeSoto?
I can't find much trace of the Pacific Fruit and Produce Company, though this truck shot in Seattle looks like the same outfit as the one that owned this truck door.
Seeing a reference to an ICC number reminds me of the old Dave Dudley classic.