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| Utilitarian minimalism. The front wheel is driven and steered by syncronous motors running on 120VAC 60Hz. Copied by other research organizations. | Conceptual Design: Gregg Podnar Mechanical Design: Gregg Podnar Electrical Design: Mike Blackwell Sensors: Kevin Dowling | 
| Neptune in its heyday.  | Neptune and unauthorized copies from other labs (2005).  | 
| An unauthorized copy.  | |