Just had a quick look in some ref.bks. re inventor. (Oh, goodness, someone didn't did they?

Given that there is a slight oversimplification in the realm of invention (many contribut something), a couple including a chronology by the US journalist James Trager award the palm to Sir Joseph Swan. He demonstrated the first 5th Feb 1877, a few monthe before Edison came up with his variant. Edison patented first, which is often the reason for thwe "first" attribution in the world of invention.

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