CCM did some interesting things... besides using Ashtabula cranks and their ubiquitous single piece hanger they also used a triplex crank very early on and there is a fairly rare "Cyclosonic" crank that uses a one piece crank (hanger) but rides on roller bearings in a smaller shell and the J55 which uses the same smaller shell and conventional bearings.

They also used British 3 piece bottom brackets and Williams cottered cranks on racing bikes and had a cartridge unit that slipped into an Ashtabula shell that had a cottered interface.

Latter day CCM's had cottered cranks that are not of the same quality as the 40's cranks and not as nice as the Ashtabula with the single piece hanger.