by observing photo-reactions between gases

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    • Patent number 2,496,239
    • Issue date Jan 31, 1950
    • G01 - MEASURING TESTING
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    2243596

    • Patent number 2,243,596
    • Issue date May 27, 1941
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    2153456

    • Patent number 2,153,456
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    2150050

    • Patent number 2,150,050
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    2150051

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    2150052

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    1525529

    • Patent number 1,525,529
    • Issue date Feb 10, 1925
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    494765

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