What is the most complex human-powered device?
Such devices seem to come in two flavors: indirect and direct. Indirect are those where a human compresses a spring and then the expanding spring actually runs the device. Or humans could create potential energy by hand some other way (pulling up on a weight, for example) which then powers the device. Wind-up watches, grandfather clocks, and various other clock-work devices fall into the indirect human-powered devices.
Direct are those where there’s no intermediate potential energy storage. Bicycles are a good example of this. Also calculators and cash registers (the kind you have to pull a lever after pressing the keys).
Anyone know of any particularly complex examples of these two kinds? Some especially complicated watch or other clockwork mechanism? Or perhaps a very complex card sorter where you have to turn a handle to run it? Or perhaps some other device I haven’t thought of?
Note: I’m not interested in cases where the potential energy is electricity stored in a battery. So wind up radios and computers are right out.