The adder subtractor/gearbox does that. There are links from the web site, or try (URL) for Leo's original design. -chris -----Original Message----- From: Nick Goetz <ngoetz@iquest.net> To: lego-robotics@crynwr.com <lego-robotics@crynwr.com> Date: (...) (26 years ago, 12-Apr-99, to lugnet.robotics)
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