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Position indicator for rotary element
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Photographic printer-processor apparatus
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Process for upgrading vacuum tubes
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Printer-processor apparatus
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Voltage regulator tube
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Electronic manometer
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Pocket ionization chamber
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Method of etching and polishing aluminum
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Gaseous discharge tube
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Glow tube
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Indicating pocket ionization chamber
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Geiger tube
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Geiger tube
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Ionization and vacuum tube chamber
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Ionization chamber
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Method and apparatus for recording or indicating
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Coin detecting and indicating apparatus
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Method and apparatus for photoelectrically assorting, recording, or computing
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