A Geothermal Power Generator which includes apparatus and method for the in-situ recovery of geothermal energy using thermionic or thermotunnelling converters. These are diode devices which produce electricity when a temperature gradient is applied across them. The electricity thus produced in a downhole environment is conducted to the surface where it can be used as an effective electrical source.

 
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< Iron particles for purifying contaminated soil or ground water

< Polarized lenses with variable transmission

> Method and apparatus for separating material

> Display panel with electron-emitting devices on substrates and cathode and anode electrodes

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