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Electricity & Electronics Passive Components
Patents & Inventions
InventionInventorYearPatent No.
CapacitorEwald Georg von Kleist1745 
CompassChina
350 AD 
Electrolytic CapacitorJulius Edgar Lilienfeld1928US2,013,564
ElectromagnetWilliam Sturgeon1825 
Fuse BlockThomas Edison1885US438,305
Inductor (Induction Coil)Michael Faraday1831 
Leyden JarPieter van Musschenbroek1746 
Lightning RodBenjamin Franklin1752 
Magnet (Lodestones)Ancient Greece600 BC 
Oudin CoilPaul Marie Oudin
Jacques d'Arsonval		1898
1898		 
Piezoelectric CrystalPierre Curie
Jacques Curie		 1880 
Potentiometer (Rheostat)Sir Charles Wheatstone1840 
RelayJoseph Henry1835 
Resistor   
Slide-Wire PotentiometerJohann Christian Poggendorff1841 
Strain-Type InsulatorHarold W. Buck
Edward M. Hewlett		1907 
Switch   
Tesla CoilNikola Tesla1891US454,622
US514,168
TransformerWilliam Stanley1886US349,611
Varistor   


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Last updated: July 2019
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