Early ideas of aerial refueling

[klem]

Published in "Техника Молодёжи-Youth Technique" from 1936 the picture shows a fuel supply in flight. The caption to the picture says "The fuel truck (aircraft tanker) flew 30 meters above us and slightly ahead. Suddenly, a hatch opened in the lower part of it, from which a thick hose descended", and I was wondering if there are other similar ideas prefiguring the in-flight fueling project before its actual realization.