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Pacman Braze-on

From WikiPedalia

A special braze-on with a slot to hold the end of the reaction arm of a hub brake to the chainstay without the need for a clamp or bolt. This makes removing and replacing the rear wheel of a bike with a hub brake considerably easier.

I believe this was first used on Santana tandems.

Pacman Braze-on Arai brake quick release
Pacman Braze-on Arai cable Quick-release