DH: thanks for that.
In my Crandall file, I have an original Crandall Arms catalog. On the cover, it states he is successor to Tobin Arms. IIRC it's about a 20 page booklet that advertises his general gunsmithing services, boring 'hard shooting' shotgun barrels, etc. along with his period commercial reloading and hunting oriented goods for sale. From the date of the printed testimonials from happy customers, I would date the catalog from the late 1920s - early 1930s.
Crandall Arms in Woodstock Ontario appears to be an earlier version of the similar "Elwood Epps" of the 1940s, Epps being then located not far away in Clinton Ontario. Since Crandall Arms reputedly existed until 1951, it's quite likely that Crandall Arms and "Ellwood Epps" operated concurrently for a time. I would expect it's almost certain that Crandall in Woodstock, Epps in Clinton, and Parkinson in London all knew each other. I bought a Carcano carbine in Parkinson's London gun shop on Saturday 23 November 1963 for testing. I was in the Epps - Clinton store a number of times in 1968, and it was quite the place. Wish I knew then, what I know now, and had some real $$$ to spend.
Too soon ve get oldt, und too late schmardt.