The 2013 AUVSI show in Washington, D.C. had quite a few robots on display including a number of water-based vehicles. They ranged from the tiny, open hardware SeaPerch to the long range Wave Glider from Liquid Robotics.
A number of years ago I did some work on a PABX. The device was electromechanical and far from state of the art, but the owner had been talked into spending a bunch of money expanding it and couldn’t justify scrapping it....More
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