Dynamo or Magneto Electric Machine – Mold for Carbonizing – Dynamo or Magneto Electric Machine – Regulator for Dynamo-Electric Machines – Regulator for Systems of Electrical Distribution – Regulator for Dynamo or Magneto Electric Machines – Electrical Generator or Motor – Insulation of Railroad-Tracks Used for Electrical Circuits – Incandescent Electric Lamp – Electrical Meter – Type-Writer – Electric-Arc Light – Incandescent Electric Lamp – Dynamo-Electric Machine – Dynamo-Electric Machine – Dynamo-Electric Machine – Incandescing Conductor for Electric Lamps – Electrical Conductor – Dynamo-Electric Machine – Method of Treating Carbons for Electric Lights – Dynamo-Electric Machine – Dynamo-Electric Machine – Mode of Operating Dynamo-Electric Machines – Electrical Meter – Dynamo-Electric Machine – Device for Protecting Electric-Light Systems from Lightning – System of Electrical Distribution – Incandescent Electric Lamp – Electrical Conductor – Filament for Incandescent Lamps – Electrical Meter – Electrical Indicator – Chemical Stock Quotation Telegraph – Incandescent Electric Lamp – Incandescent Electric Lamp – Incandescent Electric Lamp 401 to 500 This period includes patents for electrical distribution circuits and methods as well as patents for the ore refining business Edison was embarking on. He also continued to patent improvements in telegraphy, phonography, and lighting. Arthur Edwin Kennelly contributed to a variety of Edison's endeavors undertaken to create a unique product or service from 1887 to 1893. – Commutator for Dynamo-Electric Machines (1885) – System of Electric Lighting – System of Electric Lighting – System of Electric Lighting – Telephone – Telegraphy – Duplex Telegraphy – Way-Station Quadruplex Telegraphy – Mold for Carbonizing – Telephone – Electric Railway – System of Electrical Distribution – Telephonic Repeater – Electrical Signaling Apparatus – Telephone-Circuit – Incandescent Electric Lamp – Incandescing Electric Lamp – System of Electrical Distribution – Electrical Signaling Apparatus – Electrode for Telephone-Transmitters – System of Railway Signaling – Railway-Telegraphy – Electric Lamp – Incandescent Electric Lamp – Incandescent Electric Lamp – Manufacture of Carbon Conductors – Incandescent Electric Lamp – Incandescing Electric Lamp – Valve-Gear – Filament for Incandescent Electric Lamps – System of Electrical Distribution – System of Electrical Distribution – System of Electrical Distribution – System of Electrical Distribution – System of Electrical Distribution – System of Electrical Distribution – Electric Meter – Manufacture of Filaments for Incandescing Electric Lights – Electrical Transmission of Power – Electrical Transmission of Power – Electrical Transmission of Power – Electrical Transmission of Power – Electrical Transmission of Power –