[Arran]

For the most part, yes they were strictly Canadian built sets, though not all of their parts were Canadian made. Their earliest models were actually identical to U.S made Crosley sets, built under license by a Canadian branch of one of Lee DeForest's former companies, though they were probably assembled using imported parts at the time. Deforest Crosley was made for a time by an outfit called "Standard Radio Ltd." which was then taken over by Rogers-Majestic in 1933, after that they shared chassis with most other Rogers products, but with different dials and cabinets. Like for example, I think that the Deforest-Crosley Buckingham may have shared chassis with the Rogers model 10-10, with a handful of differences.
Regards
Arran