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Polyphase Alternating Current.................1883

Earthquake Machine ...............................1887

Radio Technology.....................................1891

Robotics...................................................1893

X-ray Technology .....................................1894

Broadcast Power ......................................1900

Electromagnetic Pulse..............................1901

Radar Technology ....................................1915

Particle Beam Weaponry ..........................1917

Death Ray................................................1943

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12y ago

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