thepianoplayer416 Heintzman may have been the only name out of Canada but within Canada there were several. I just don't have a 'feel' for the relative quality when they were in their respective heydays. In addition to the ones already mentioned I have seen names including Lesage, Bell, Sherlock-Manning, and Nordheimer. There may well be others, since it seemed to be a thing that furniture makers and others pivoted to in the late 19th and early 20th centuries.
I'm not aware of any major manufacturers, or commercial scale manufacturing within Canada today, although there may always be some enthusiasts or small-scale prototype builders that are only known to those in the business.