US1833070A
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Electromechanical translating device
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US1835015A
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Plate circuit excitation
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US1858323A
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Apparatus for energizing an audion circuit
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US1826743A
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Apparatus for energizing an audion circuit
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US1856182A
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Electrical filter
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US1815141A
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Voltage regulator
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US1767052A
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Voltage regulator
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US1691022A
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Voltage regulator
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US1691909A
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Voltage regulator
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US1704791A
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Rectifying alternating current
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US1759545A
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Eliminating effect of variations in current supplied to audions
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US1804859A
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Filtering electric currents
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