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The Concept Map you are trying to access has information related to:
electricity & magnetism, gravity, electricity and magnetism, telephone, complete description, lightning storm, xerox machine copier, andre marie ampere, eighteenth century, magnets on refrigerator doors, radio and television, electrical & magnetic phenomena, four equations, two aspects, alessandro volta, flashlight, auto windshield wiper motor, 1861, same force, james clerk maxwell, many mundane everyday experiences