Why was Menlo Park, New Jersey called an "invention factory". What did this factory produce?
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The laboratory at Menlo Park was an "invention factory" and a business. The factory produced the incandescent lamp, dynamos, switches, electric meters, fuses, distribution lines, and regulators.
Edison conducted experiments at his Menlo Park, New Jersey, laboratory. He did not work alone. A team of talented workers assisted him all hours of the day and night. These men had the skills to make Edison's ideas and sketches into real devices of wood, wire, glass, and metal.