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EDTEK, Inc.
Development of a solar thermophotovoltaic system using a resonant micro-mesh infrared filter.
http://www.edtekinc.com/
JX Crystals, Inc
The company carries out research in several fields in thermophotovoltaics and is a manufacturer of low bandgap gallium antimonide (GaSb) photovoltaic cells.
http://www.jxcrystals.com/