The red coaster bike from panel #9, I don't think I have seen a chain ring like that before......
Those are early Schwinn accessory bolt on cantilever brakes. They were popular klunker upgrade brakes from what I understand but may have had the tendency to slip a little and not be super strong brakes. The better upgrade for early downhill race klunkers was adding braze-on canti mounts to the fork of choice when cantis became more widely available. Drum brakes were popular, of course, but heavy. If you can find a set of these Schwinn accessory canti brakes they can be quite expensive.
View attachment 276970
View attachment 276971
Early Breezer with braze-on canti brake mounts
View attachment 276972