A compact multiplexing control device combines simplicity with efficiency, ease of use, and quick access, and enables a user to switch among multiple functions. The multiplexing control device is comprised of two main components: a selector and an executor. The selector is a manually rotatable ring labeled...http://www.google.de/patents/US6340800?utm_source=gb-gplus-sharePatent US6340800 - Multiplexing control device and method for electronic systems
