I've been using this unit since around 1962-63.
Can be seen mounted on the wall behind the right gas pump at my father's garage.
Years later we mounted it on my father's garage at home. It stayed there until a few days ago.
I still used it to fill my mother's car/lawn mower tires and to blow things off.
Although it still works,,,sort of. I'm going to rebuild it. As near as I can tell, production of these units began in 1947.