Documents on the distribution of electric power & Niagara falls hydroelectric power station

Niagara Falls Power Company congratulates Nikola Tesla on his 75th birthday, July 10, 1931.
Niagara Falls Power Company congratulates Nikola Tesla on his 75th birthday, July 10, 1931.
 Westinghouse Electric and Manufacturing Company congratulates Nikola Tesla on his 75th birthday, July 10, 1931.
Westinghouse Electric and Manufacturing Company congratulates Nikola Tesla on his 75th birthday, July 10, 1931.

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