caught on only slowly, by the 1930s it was common across the U.S., eventually becoming, for a few decades, the country's dominant form of lit signage.

Ocean thermal energy conversion

Claude's mentor and friend was Jacques-Arsène d'Arsonval, the inventor of the "Ocean Thermal Energy Conversion" (OTEC) concept. Claude was also the first person to build prototype plants of that technology. Claude built his plant in Cuba in 1930. The system produced

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