-
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3469639
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Patent number 3,469,639
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Issue date Sep 30, 1969
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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3187824
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Patent number 3,187,824
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Issue date Jun 8, 1965
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E21 - EARTH DRILLING MINING
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3169588
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Patent number 3,169,588
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Issue date Feb 16, 1965
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G01 - MEASURING TESTING
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3107740
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Patent number 3,107,740
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Issue date Oct 22, 1963
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR