I think many of the early frames were imported to Canada from Italy for assembly and later bikes were sourced from where ever.
I always thought the Miele bicycles were built and assembled in Canada. I have a couple of old Miele catalogs and they show the Miele plant and the jigs in the plant that were used to build bicycle frame sets.
This is not to say that some Miele bicycles were not built elsewhere, but I have never seen evidence to support that possibility.