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Differential current detector
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Electronic clock radio having nap/sleep feature
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High voltage protection circuit
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Phase-locked loop having a switched lowpass filter
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Method and apparatus for attaching connecting wire to terminals of one or more circuit boards
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Electrical switching means
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Push button switch assembly
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Telephone intercommunication systems
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Traffic signal hanger
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Telephone intercommunication systems
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Storage of informationp
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Line switching arrangements for telephone intercommunication systems
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Multi-circuit selection filter for two different frequency ranges
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Variable inductive resonant circuit arrangement having a diamagnetic core for the UHF range
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Variable oscillating circuit arrangement for UHF range
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Mounting cabinet
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Telephone intercommunication system incorporating dialling arrangement
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Cradle switch for telephone apparatus having self-aligning, pivoted contact assembly
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Telephone intercommunication system provided with a common communication line to which access is guarded
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Telephone intercommunication system providing common access to a communication line
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