Even so, about who invented the incandescent, the historian Robert Friedel and Paul Israel list 22 inventors of this lamp type before Joseph Swan and Thomas Edison. They conclude that Edison's incandescent lamp version than the other versions because of the combination of three factors: the material burned more efficiently, the vacuum in the bulb is higher than the other versions (using the Sprengel pump) and a higher resistance makes distribution from a central source could be done in an economical way
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