Promethean Power is one of the anchor tenants at clean-tech incubator Greentown Labs in South Boston, which has work space for engineers to build hardware prototypes and test them out. This photo is from their grand opening last year which attracted city officials and local entrepreneurs.
January 29, 2012 4:00 AM PST
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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