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Motor control system
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Half frequency power supply for vibrating machines
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Structures for grid control gas tubes
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Indirectly heated cathode for gas tubes
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Grid control gaseous discharge rectifier tube
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Insulated shielding structure for gaseous discharge tube
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Mounting structure for gas tubes
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Electrode assembly for gas tubes
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Indirectly heated cathode structure
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Chromium sulfate coated electrode
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Method of forming oxide coating on tantalum electrodes
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Hot cathode grid control gas tube
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Electron discharge tube structure
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Controllable electron discharge tube having low tube losses
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Grid control metal envelope gas tube
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Tantalum anode for gas filled tubes
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Control apparatus for gas tubes
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Electron discharge device
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Controllable electron discharge tube of the multiple cathode type
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Gas filling for grid control gas tubes
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