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It's Tesla's Birthday. Here's the stamps by Government of India.

Aerial arc light atmospheric energy harvesting 1920 Ewald Rasch GB179967 calls atmospheric electric potential cosmic electricity because the sun is a cathode and space is a vacuum tube

Rechargeable battery for electric vehicles with extreme power density (example is 5.5 kWh/kg) 1908 Walter M Jackson US947238

Simple high power earth battery 1892 Michael Emme US495582 - example 3 KW array with 43 divots 10x15x15" - each 5" hole 15" deep produces 10 W (1.25V 8A)

Simple high power earth battery with iron and carbon electrodes in electrolyte infused mud, describes 3 KW example, 70 W per cell 1892 Michael Emme US495582

Lifting water as vapor to generate power? Walter Stoker 1938 US2265878

New research shows Nikola Tesla's valve works better than anyone realized, could have untapped potential

Improved Tesla Valve CFD simulation