> From: "Thomas Lehmann"
> > 2. A directed movement of a part for transportation purposes could only be
> > achived with a unsymetrical waveshape.

I don't think this is true. There are *many*
mechanisms where transportation will work well
with an equal waveshape;

* when the back/forth movement has a vertical
component, as shown by the 20 degree angle of
the device in your picture.

* when the friction surface has a uneven friction
system, like the angled plastic "carpet" fibres
shown on the web page for that commercial system.
Horizontal vibration is all that is required.
-Roman

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