While looking at a 1929 Kohler plumbing fixture catalog online, I saw they made (or sold) a wringer washer. It even came in all their fixture colors! They also had a combination sink-clothes washer, similar to their sink-dishwasher.
https://archive.org/details/ModernBeautyAndUsefulnessInPlumbingFixtures/page/n61/mode/2up
https://archive.org/details/ModernBeautyAndUsefulnessInPlumbingFixtures/page/n61/mode/2up