In Milwaukee, 1972, I owned two Peugeot folding bicycles. They were just right for apartment living. They had hand brakes and had a 3 speed shifter. We had a baby seat mounted on one of them. I bought the bikes from a discount store, Treasure Island which was along the lines of a K-Mart.
I thought at the time that they were a great idea and would really catch on. I guess that I was just 3 decades early.