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Power supplies with latch-up prevention and automatic back-up
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Signalling and channel loop test circuit for station carrier telephone system
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Fail safe surge arrester systems
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Surge arrester assembly
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Solid state hybrid circuits
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Telephone carrier system repeater and power supply
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Signalling and channel loop test circuits for station carrier telephone system
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Process for treating cyanide and cyanate containing wastewaters
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Process for treating cyanide and cyanate-containing wastewaters
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Transformerless hybrid circuits
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Surge suppression
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Two-stage oxidative system
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Waste treatment system
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Fail safe surge arrester systems
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Apparatus for removing foam
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Signalling and channel loop test circuits for station carrier telephone system
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Amplitude modulated telephone carrier system and terminal equipment therefor
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Apparatus forthe treatment ofa fluid
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Fail-safe/surge arrester systems
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Thermal switch short circuiting device for arrester systems
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