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It is not at all unusual for two or more people to be working on the same problem at the same time, and coming up with similar ideas almost simultaneously, without any contact between the two. This is the case with these two men and a practical, economically useful, incandescent bulb.

Joseph Swan made an incandescent light bulb before Edison did so, but Edison's team came up with their ideas without any help from Swan's work. Swan thus had the patent in Great Britain; Edision in the USA. Rather than fight out who held the patents around the world, the two simply agree to join their patents as one.

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