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Input cord set for analog automatic telephone exchange
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Data source check-up method
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The measuring method of ultrasmall optical losses
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Measure the method for the optical loss of optic fiber end face and end face junction
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Reflected light light loss assay method in the light transmitting fiber
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Measure the method for optical loss in the butt joint photoconduction with reflected light
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Measure the method for optical loss in the fiber light guide with reflected light
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Method of setting up call in analogue automatic telephone exchange
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System for stabilized dc voltage supply
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Electromagnetic relay with two stable states
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Stabilized semiconductor converter
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Dc voltage control method
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Stabilized semiconductor converter
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Coin-freed telephone
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Multichannel device for handling interrogates with absolute priority
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Peripheral processor for telephonic switching system
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Device for exposing light-sensitive material
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