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US2459701A
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Mechanical instrument holder
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US2453507A
|
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Loose-leaf binder
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US2499917A
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Gas feeding and metering apparatus
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US2527419A
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Pressure controlled operating means
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US2529251A
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Volumetric gas feeding apparatus
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US2529252A
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Pressure actuated control mechanism
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US2459700A
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Control valve
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US2505491A
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Control mechanism for gravimetric feeders
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US2422352A
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Control means for automatic regulating mechanism
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US2416994A
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Automatic control for gravimetric feeders by the weight of the material in the supply container
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US2404288A
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Actuating means
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