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Patent drawing - Fleming Valve - US Patent 803,684 Public domain  image

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Patent drawing - Fleming Valve - US Patent 803,684 Public domain image

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Summary

United States Patent 803,684; first sheet. Illustrations of the 'Fleming Valve', the first useful vacuum tube. John Ambrose Fleming, inventor.

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Date

07/11/1905
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Source

USPTO
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Copyright info

public domain

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