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KR920006146B1
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Subscribers information analysis system
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KR920009336B1
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Automatic answering machine
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KR920006145B1
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Dialing and answering simulator
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KR920006278B1
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Simulator for automatic parallel tone signaling apparatus
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KR890005367B1
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Interexchange of signals
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KR890004854B1
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Ring zero cross sensing circuit
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KR890003226B1
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Box fixed transfer apparatus of automatic taping machine
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KR890003764B1
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Telephone holding display circuit
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KR890002323B1
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Rom memory expanding circuit
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KR890005368B1
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Telephone with holding circuit and muting circuit
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KR890003189B1
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Ringing system in automatic or semi automatic exchanges
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KR890003187B1
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Telephone circuit
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KR890000982B1
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Pulse code modulation system exchanger
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KR890000279B1
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Intergrated circuit lead vending and cutting device
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KR890000983B1
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Non-locking line selecting control circuit of telephone
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KR880000313B1
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Galvanometer operating circuits for electro cardio graph
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KR890001527B1
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Injection moulding method for multilayered articles for key pad button
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KR890000592B1
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Muxic on hold function control switching circuit of telephone
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KR880000198B1
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Liquid filling apparatus
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KR880000080B1
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On hook dial device
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