Back in the seventies, Inglis was the equivalent of Whirlpool here in Canada. The Inglis Royal models had the same features as Whirlpool Imperials in the States.
Later, Whirlpool began selling it's US appliance lines here too and Inglis became a cheaper brand between Whirlpool and Roper. Kitchen Aid was above Whirlpool.
Nice models. Few washers ever had THREE speeds. And the 70s models were more techno than before or since (until the computer ones that are unreliable because computers don't like water).
There were several washer brands/models that sported three motor speeds. Kenmores and Whirlpools (both belt-drive and direct-drive), KitchenAid (although KA of course is Whirlpool), GE, Frigidaire, Norge. Possibly others.