In the mid-1960s, Dieter Rams and Reinhold Weiss designed Braun's H7, a portable fan and heater.

It had one fan setting, and two heat settings. Rams and Weiss made the control beautifully simple and intuitive:

Alas, the version for the U.S. market had to be dumbed down:

The units were durable, and today you can still find the H7 on secondhand sites.