Just to add a little complexity to the earlier asked simple question of who built the 40mm Bofors in Canada, it was, indeed, built by Otis-Fensom Elevator Co. Ltd. in London, Ontario. They also manufactured the 40mm gun barrels and mounting assemblies. In addition they also built the 2 and 6-pdr gun barrels and mountings.
As in any well organized war production effort, the following companies supplied 40mm Bofors parts to Otis:
Atlas Steels Ltd - Welland, ON - 40mm gun forgings
Barnes Wallace Co. Ltd - Hamilton, ON - 40mm gun springs
Canada Electric Castings Ltd. - Orillia, ON - gun castings
Ferranti Electric Ltd. - Mount Dennis, ON - 40mm Bofors magslips
Pressure Castings of Canada Ltd. - Weston, ON - 40mm chargers
40mm ammunition cases were made by:
Aluminum Goods Company - Toronto, ON
Pedlar People Ltd. - Oshawa, ON
40mm shells were made by:
Babcock-Wilcox Ltd. - Galt, ON
Goldie-McCulloch Ltd. - Galt, ON
Ingersoll Machine & Tool Co. Ltd. - Ingersoll, ON
Massey-Harris Co. Ltd. - Toronto, ON
W. H. Banfield & Sons Ltd. - Toronto, ON
Probably a lot of other contributers as well, but thought I'd share what I was aware of so far.
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