CN2111600U - Diplex carrier telephone set - Google Patents

Diplex carrier telephone set Download PDF

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Publication number
CN2111600U
CN2111600U CN 91231598 CN91231598U CN2111600U CN 2111600 U CN2111600 U CN 2111600U CN 91231598 CN91231598 CN 91231598 CN 91231598 U CN91231598 U CN 91231598U CN 2111600 U CN2111600 U CN 2111600U
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resistance
circuit
connect
pin
capacitor
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任国祚
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Abstract

The utility model relates to a diplex carrier telephone set which transmits with the electric line of force. It is designed mainly for overcoming the drawback that other phones need to erect telephone line alone. The utility model is provided with a transmitting circuit and a receiving circuit. The transmitting circuit selects and transmits the center carrier frequency through a frequency modulation circuit and its dialing frequency selection circuit. One coil of the coupling transformer connects with the output terminal of the transmitting circuit. Another coil connects with the input terminal of the receiving circuit. The third coil connects to the electric line of force by a capacitor and the high frequency choke coil. The capacitor can abrupt the alternating current of 50Hz by the carrier signal. The utility model has advantages of low cost of installation and it is mainly used for the wide countryside.

Description

Diplex carrier telephone set
The utility model relates to a kind of duplex telephone carrier with power line transmission.
At present, the extensive verbal system that adopts of China has city automatic telephone, wireless tranceiver and telephone exchange etc.The city automatic telephone is modern communication tool, popularized substantially in the big small city and the cities and towns of China, but the installation fee of this phone is more expensive, can't spread to vast rural area at present.Telephone exchange is a kind of verbal system that adopts within the specific limits, a switch for example is installed in factories and miness enterprises and institutions or village, farm, can hold ten in this scope converses mutually to tens call gates, this talking mode will have special messenger's operate switch, and will put up telephone lines separately, invest bigger.Wireless tranceiver is a kind of verbal system that public security cadres and police adopt when executing the task, and it is very big to the interference of other communication apparatus and radio and television, and uses this equipment to ratify through local Wireless Management Committee.
The utility model is a kind of duplex telephone carrier that designs for the shortcoming that overcomes above-mentioned prior art, and it utilizes power line as transmission line, does not need to put up telephone lines separately.
Technical solution of the present utility model is, a kind of duplex telephone carrier by power line transmission, and it has transtation mission circuit and receiving circuit.
Transtation mission circuit comprises:
Microphone, it changes the sound wave of speech into the signal of telecommunication.
The fixed ampllitude amplifier, it amplifies the audio signal of microphone output, and is limited in the certain amplitude.
Give emphasizer, it improves the amplitude of the high frequency composition of the audio signal of fixed ampllitude amplifier output, when frequency modulation, makes the high frequency composition have identical signal to noise ratio with the low frequency composition.
Fm modulation circuit, it produces high frequency carrier, and the audio signal level that gives emphasizer output is removed to modulate high frequency carrier.
Output amplifier, it carries out the signal of fm modulation circuit output to export after the power amplification.
Receiving circuit comprises:
Wide-band amplifier, it amplifies the carrier signal that receives.
Amplitude limiter circuit, it carries out double limiting to the signal of wide-band amplifier output.
Demodulator circuit, it carries out demodulation, output audio signal with the carrier signal of amplitude limiter circuit output.
Deaccentuator, the audio signal that it exports demodulator circuit returns to give and increases the weight of former state.
Audio frequency amplifier, it amplifies the audio signal of deaccentuator output.
Loud speaker, earphone and pressure key switch, loud speaker is connected with audio frequency amplifier by pressing key switch with earphone.When earphone is picked up, press key switch that earphone is connected, loud speaker is disconnected.During the earphone on-hook, press key switch that loud speaker is connected, earphone is disconnected.
Squelch circuit, it is connected with audio frequency amplifier with demodulator circuit.When not receiving this machine receiving frequency signals, it will exchange interference signal ground connection, make not sounding of earphone and loud speaker.
Its special character is that it also comprises:
The fixed ampllitude amplifier has the ring switch, when the ring switch is pressed, regenerative circuit is connected, and the fixed ampllitude amplifier produces self-oscillation, is emitted in the frequency of oscillation in the audiorange, makes the loud speaker of the other side's phone send ringing tone.
Fm modulation circuit has the dialing frequency selection circuit, and fm modulation circuit can be selected different centre carrier frequencies by the dialing frequency selection circuit.The dialing frequency selection circuit is made up of clock pulse generator, pulsqe distributor, key switch and analog switch.
Coupling transformer, its former limit is connected with the output of the output amplifier of transtation mission circuit, and its one pair of limit is connected it another pair limit and capacitor C with the input of the wide-band amplifier of receiving circuit 17, C 18Connect.
Capacitor C 17, C 18, their end is connected with coupling transformer, the other end and high frequency choke coil L 4, L 5Connect, the alternating current that they cut off 50HZ passes through carrier signal.
High frequency choke coil L 4, L 5, their end respectively with capacitor C 17, C 18Connect, the other end is connected with power line, and they can control the high frequency clutter on the power line, make it to import into the receiving terminal of this machine.
The utility model does not need to put up telephone lines separately owing to adopt power line as transmission line, does not need telephone exchange, and installation cost is very low, need not prop up and charge for telephone.Telephone set can move, and receives on the power line with plug, socket and just can converse, and is not subjected to the restriction in place.Its conversation sound is clear, can transmit 2 kilometers in same transformer scope, and non-industrial area can be transmitted 5 kilometers in the rural area.The utility model can be realized the intercommunication of frequency division system duplex owing to have independent transtation mission circuit and receiving circuit.Vast rural area is given in enforcement of the present utility model, and the communication of enterprises and institutions inside brings great convenience.
Below in conjunction with accompanying drawing an embodiment of the present utility model is described in detail.
Fig. 1 is the circuit block diagram of present embodiment, and as Figure of abstract.
Fig. 2 is the circuit diagram of present embodiment.
As shown in Figure 1, the utlity model has transtation mission circuit and receiving circuit.Transtation mission circuit comprises: microphone, fixed ampllitude amplifier, give emphasizer, fm modulation circuit, dialing frequency selection circuit and output amplifier.Receiving circuit comprises: wide-band amplifier, amplitude limiter circuit, demodulator circuit, deaccentuator, audio frequency amplifier, squelch circuit, earphone and loud speaker.
As shown in Figure 2, resistance R 1Be the biasing resistor of microphone M, capacitor C 1Be capacitance, resistance R 2With capacitor C 1Composition is to the bleeder circuit of audio signal.The sound wave of speech changes the signal of telecommunication into by microphone, again through resistance R 3Input fixed ampllitude amplifier.Fixed ampllitude amplifier and ring switch are by capacitor C 3, C 4, C 5, C 6, 1CR, resistance R 4, R 5, R 6, R 7, R 8, R 9, R 10, R 11, R 12, R 13, diode D 2, triode Q 1, Q 2, Q 3, key switch ANR forms.Capacitor C 3Be capacitance, its end is as fixed ampllitude amplifier input terminal a, with resistance R 3An end connect C 3The other end and triode Q 1Base stage connect.Resistance R 4Be connected across triode Q 1Base stage and collector electrode between.Resistance R 5An end and triode Q 1Collector electrode connect, the other end is connected with positive source.Resistance R 7An end and triode Q 1Emitter connect other end ground connection.Resistance R 6An end be connected the other end and triode Q with positive source 2Base stage connect.Resistance R 8An end and triode Q 2Base stage connect other end ground connection.Resistance R 9An end be connected the other end and triode Q with positive source 2Collector electrode connect.Resistance R 10An end and triode Q 2Emitter connect other end ground connection.Capacitor C 5Be connected across triode Q 1Collector electrode and triode Q 2Base stage between.Capacitor C 6An end and triode Q 2Collector electrode connect, the other end is as the output b of fixed ampllitude amplifier, with resistance R 15An end connect.Resistance R 12An end be connected R with the b point 12The other end and resistance R 13, R 11An end connect R 13Other end ground connection, R 11The other end and diode D 2Positive pole connect D 2Negative pole and triode Q 3Base stage connect.Capacitor C 4An end and triode Q 3Base stage connect other end ground connection.Triode Q 3Grounded emitter, collector electrode is connected with a point.The end of capacitor ICR is connected with the b point, and the other end is connected with a point by key switch ANR.Resistance R 14With capacitor C 2Power filter for the fixed ampllitude amplifier.Resistance R 4Be triode Q 1Negative feedback resistor.Resistance R 7, R 10Negative feedback is arranged.Resistance R 12, R 13With the signal dividing potential drop after amplifying, through diode D 2Rectification, capacitor C 4Filtered direct voltage provides triode Q 3The base stage bias current.Because of triode Q 3Collector electrode be connected on the fixed ampllitude amplifier input terminal, can limit the input of strong signal.Suitably select resistance R 11, R 12, R 13Resistance, when to make the input signal of ordering as a be 10mV～2V, output b was stabilized in about 1V.When key switch ANR pressed, the fixed ampllitude amplifier formed positive feedback, produced self-oscillation, suitably selected the capacitance of capacitor ICR, and making frequency of oscillation is 1000HZ, and this oscillator signal can be received as bell signal by the other side's phone.Give emphasizer by resistance R 15, R 16, R 17, capacitor C 10, C 11Form, it improves the amplitude of the high frequency composition of the audio signal of fixed ampllitude amplifier output, when frequency modulation, makes the high frequency composition have identical signal to noise ratio with the low frequency composition.Fm modulation circuit is by integrated circuit (IC) 1, capacitor C 12, C 13, C 14, C 15, C 19, voltage-stabiliser tube D 1, resistance R 18, adjustable resistance W 0, W 1W 9Form.The dialing frequency selection circuit is by integrated circuit (IC) 2, IC 3, IC 4, IC 5, IC 6, resistance R 24, R 25, R 26, capacitor C 19, key switch AN 0, AN 1AN 9, key switch AN 11Form.IC 1Adopt integrated circuit 567, IC 2Adopt NOR gate 4001, IC 3Adopt decades pulse distributor 4017, IC 4, IC 5, IC 6Adopt four bidirectional analog switches 4066.Integrated circuit (IC) 2With resistance R 24, resistance R 26, capacitor C 19Form a clock pulse generator.IC 24 pin be output, with integrated circuit (IC) 314 pin connect.Capacitor C 19Be connected IC 22 pin and 4 pin between.Resistance R 26An end and IC 22 pin connect the other end and IC 23,5,6 pin connect.IC 214 pin be connected IC with positive source 27,8,9,10,11,12,13 pin ground connection, IC 21 pin be connected with the f point.Resistance R 24An end be connected with the f point, the other end is connected with positive source.When the f point is low level, IC 24 human hair combing wastes go out pulse, when the f point is high level, IC 2Stop paying out pulse.Resistance R 25An end ground connection, the other end and IC 315 pin connect.IC 316 pin be connected with positive source.Key switch AN 11Two ends and IC 315 pin, 16 pin connect. IC 31,2,3,4,5,6,7,9,10,11 pin respectively with key switch AN 0, AN 1AN 9An end connect key switch AN 0, AN 1AN 9The other end be connected with the f point.IC 38 pin ground connection, IC 31,2,3,4,5,6,7,9,10,11 pin as three four bidirectional analog switch I C of output control 4, IC 5, IC 6, analog switch IC 4, IC 5, IC 6With adjustable resistance W 0, W 1W 9Connect.Key switch AN 11Be used for zero clearing, IC 310 outputs generally have only one to be high level, all the other are low level, AN 11When pressing, IC 3All outputs all be low level.As key switch AN 0, AN 1AN 9When one of them was pressed, the current potential that f is ordered was identical with the current potential of this output, becomes low level by original high level, IC 2Send pulse, IC 3After receiving certain umber of pulse, this output becomes high level by low level, makes the f point become high level, IC by this key switch simultaneously 2Stop paying out pulse and realize auto-lock function, become the output control analog switch IC of high level by low level 4, IC 5, IC 6In a road connect, make adjustable resistance W 0, W 1W 9In one receive integrated circuit (IC) 15 pin and 6 pin between.IC 22 pin be connected capacitor C with the output C that gives emphasizer 12, C 13, C 14, C 15, C 19An end ground connection, their other end respectively with IC 12,1,3,6,4 pin connect IC 17 pin ground connection, IC 14 pin and resistance R 18An end and voltage-stabiliser tube D 1Negative pole connect R 18The other end be connected D with positive source 1Plus earth.IC 15 pin be output, be connected with the input of output amplifier.Resistance R 18, capacitor C 19With voltage-stabiliser tube D 1To IC 1Power supply carry out voltage regulation filtering.Capacitor C 12, C 13, C 14Be filter capacitor.IC 1Connect into a voltage controlled oscillator, its produces high frequency carrier and falls to being modulated on the carrier wave from the audio signal of giving emphasizer and exports.Capacitor C 15And IC 15,6 pin between the centre frequency of resistance decision carrier wave, the amplitude of giving the audio signal of emphasizer output just makes IC 1Frequency of oscillation produce frequency shift (FS), thereby finish the frequency modulation modulation.Output amplifier is by resistance R 19, R 20, R 21, R 22, R 23, capacitor C 16, coupling transformer T 1, triode Q 4, Q 5Form.Resistance R 19, R 20With triode Q 4Form an emitter follower, conversion is carried out in impedance.Capacitor C 16Be coupling capacitance.Resistance R 21, R 22, R 23, coupling transformer T 1With triode Q 5Form a power amplifier, carrier signal is carried out power amplification, by coupling transformer T 2Pay limit L 2Send on the power line.Coupling transformer T 2Former limit L 1Be connected triode Q 5Collector electrode and positive source between.T 2One pay limit L 3An end ground connection, the other end is connected with the input i of the wide-band amplifier of receiving circuit.T 2Another pair limit L 2Two ends respectively with capacitor C 17, C 18An end connect capacitor C 17, C 18The other end respectively with high frequency choke coil L 4, L 5An end connect high frequency choke coil L 4, L 5Other end g, h be connected with power line.Coupling transformer T 1Pay limit L 2, capacitor C 17, C 18, high frequency choke coil L 4, L 5Be used for the carrier signal that this machine transtation mission circuit sends is delivered to power line, perhaps the carrier signal that other phone is sent receives this machine.Suitably select capacitor C 17, C 18Capacitance, make its alternating current that can cut off 50HZ, and carrier signal is passed through smoothly.
As shown in Figure 2, wide-band amplifier is by resistance R 26, R 27, R 28, R 29, capacitor C 20, C 21, C 22, C 23, inductance L 6With triode Q 6Form.C 20, C 22Be coupling capacitance.C 21Be filter capacitor.Resistance R 28And inductance L 6The needs that can adapt to ten channel bandwidths.Resistance R 37, capacitor C 35With voltage-stabiliser tube D 3Power supply to wide-band amplifier carries out voltage stabilizing and filtering.Coupling transformer T 1Pay limit L 2Receive from other phone carrier signal, through another pair limit L from power line 3Delivering to wide-band amplifier amplifies.Resistance R 30, R 31Form a bleeder circuit.Amplitude limiter circuit is by diode D 5, D 6Form.The signal of wide-band amplifier output is through resistance R 30, R 31Dividing potential drop is again through diode D 5, D 6Double limiting, the input demodulator circuit.Demodulator circuit is by resistance R 32, adjustable resistance R 34, capacitor C 24, C 25, C 26And integrated circuit (IC) 7Form.IC 7Adopt integrated circuit 567.C 24Be coupling capacitance, C 25Be filter capacitor.IC 7Connect into an oscillator, adjustable resistance R 34With capacitor C 26The centre frequency that this machine of decision receives.IC 7Has phase-locked function, within the specific limits the acquisition tracking receive frequency.Demodulator circuit is with the carrier signal demodulation of input, output audio signal.Deaccentuator is by resistance R 35, R 36, capacitor C 27, C 28, C 29Form.The audio signal that deaccentuator is exported demodulator circuit returns to give and increases the weight of former state.Audio frequency amplifier is by resistance R 38, R 39, R 40, R 41, R 42, R 43, adjustable resistance W 11, capacitor C 30, C 31, C 32, transformer T 2With triode Q 7, Q 8Form.C 30, C 32Be coupling capacitance.The audio signal of deaccentuator output is through adjustable resistance W 11After the dividing potential drop, the input audio frequency amplifier carries out power amplification.Loud speaker Y is connected with the output of audio frequency amplifier by pressing key switch S with earphone RG, when earphone RG picks up, presses key switch S that earphone RG is connected, and loud speaker Y is disconnected.During earphone RG on-hook, press key switch S that loud speaker Y is connected, earphone RG is disconnected.Squelch circuit is by resistance R 33, capacitor C 33With diode D 4Form.Squelch circuit is connected with the input of demodulator circuit and audio frequency amplifier, and when not receiving this machine receiving frequency signals, it will exchange interference signal ground connection, makes not sounding of earphone and loud speaker.
This telephone set should be installed in electronic component on the printed circuit board (PCB) during fabrication, regulates adjustable resistance W 0, W 1W 9, can send the carrier wave of 10 kinds of frequencies altogether.Regulate adjustable resistance R then 34, determine the receive frequency of this machine.Like this, 10 this phones can be installed in same scope.After the adjustable resistance adjusting, just printed circuit board (PCB) can be installed in the casing of phone.Button AN 0, AN 1AN 9, AN 11, ANR is installed in outside the casing.Microphone and earphone are placed on the casing outside, and are pressed on the key switch.Loud speaker is installed in the casing, leaves sound hole on the casing.2 of g, h guide to casing by lead and are connected with plug outward.
During use, if desired to which platform phone conversation, this phone corresponding key switch should be clicked, then by the ring switch, the other side's phone can be heard the tinkle of bells by loud speaker, when the other side picks up earphone, should tell the other side with the phone numbering of oneself, the other side clicks corresponding key, but just intercommunication of both sides at this moment.

Claims (3)

1, a kind of duplex telephone carrier by power line transmission, it has transtation mission circuit and receiving circuit,
Transtation mission circuit comprises:
Microphone, it changes the sound wave of speech into the signal of telecommunication;
The fixed ampllitude amplifier, it amplifies the audio signal of microphone output, and is limited in the certain amplitude;
Give emphasizer, it improves the amplitude of the high frequency composition of the audio signal of fixed ampllitude amplifier output, when frequency modulation, makes the high frequency composition have identical signal to noise ratio with the low frequency composition;
Fm modulation circuit, it produces high frequency carrier, and the audio signal level that gives emphasizer output is removed to modulate high frequency carrier;
Output amplifier, it carries out the signal of fm modulation circuit output to export after the power amplification;
Receiving circuit comprises:
Wide-band amplifier, it amplifies the carrier signal that receives;
Amplitude limiter circuit, it carries out double limiting to the signal of wide-band amplifier output;
Demodulator circuit, it carries out demodulation, output audio signal with the carrier signal of amplitude limiter circuit output;
Deaccentuator, the audio signal that it exports demodulator circuit returns to give and increases the weight of former state;
Audio frequency amplifier, it amplifies the audio signal of deaccentuator output;
Loud speaker, earphone and pressure key switch, loud speaker is connected with audio frequency amplifier by pressing key switch with earphone, when earphone is picked up, presses key switch that earphone is connected, and loud speaker is disconnected, and during the earphone on-hook, presses key switch that loud speaker is connected, and earphone is disconnected;
Squelch circuit, it is connected with audio frequency amplifier with demodulator circuit, and when not receiving this machine receiving frequency signals, it will exchange interference signal ground connection, make not sounding of earphone and loud speaker;
It is characterized in that it also comprises:
The fixed ampllitude amplifier has the ring switch, when the ring switch is pressed, regenerative circuit is connected, and the fixed ampllitude amplifier produces self-oscillation, is emitted in the frequency of oscillation in the audiorange, makes the loud speaker of the other side's phone send ringing tone;
Fm modulation circuit has the dialing frequency selection circuit, and fm modulation circuit can be selected different centre carrier frequencies by the dialing frequency selection circuit, and the dialing frequency selection circuit is made up of clock pulse generator, pulsqe distributor, key switch and analog switch;
Coupling transformer, its former limit is connected with the output of the output amplifier of transtation mission circuit, and its one pair of limit is connected it another pair limit and capacitor C with the input of the wide-band amplifier of receiving circuit 17, C 18Connect;
Capacitor C 17, C 18, their end is connected with coupling transformer, the other end and high frequency choke coil L 4, L 5Connect, the alternating current that they cut off 50Hz passes through carrier signal;
High frequency choke coil L 4, L 5, their end respectively with capacitor C 17, C 18Connect, the other end is connected with power line, and they can control the high frequency clutter on the power line, make it to import into the receiving terminal of this machine.
2, according to the described a kind of duplex telephone carrier of claim 1, it is characterized in that described fixed ampllitude amplifier and ring switch are by capacitor C by power line transmission 3, C 4, C 5, C 6, 1CR, resistance R 4, R 5, R 6, R 7, R 8, R 9, R 10, R 11, R 12, R 13, diode D 2, triode Q 1, Q 2, Q 3, key switch ANR forms, capacitor C 3An end be fixed ampllitude amplifier input terminal a, C 3The other end and triode Q 1Base stage connect resistance R 4Be connected across triode Q 1Base stage and collector electrode between, resistance R 5An end and triode Q 1Collector electrode connect R 5The other end be connected resistance R with positive source 7An end and triode Q 1Emitter connect R 7Other end ground connection, resistance R 6An end be connected R with positive source 6The other end and triode Q 2Base stage connect resistance R 8An end and triode Q 2Base stage connect R 8Other end ground connection, resistance R 9An end be connected R with positive source 9The other end and triode Q 2Collector electrode connect resistance R 10An end and triode Q 2Emitter connect R 10Other end ground connection, capacitor C 5Be connected across triode Q 1Collector electrode and triode Q 2Base stage between, capacitor C 6An end and triode Q 2Collector electrode connect C 6The other end be the output b of fixed ampllitude amplifier, resistance R 12An end be connected R with the b point 12The other end and resistance R 13, R 11An end connect R 13Other end ground connection, R 11The other end and diode D 2Positive pole connect D 2Negative pole and triode Q 3Base stage connect capacitor C 4An end and triode Q 3Base stage connect C 4Other end ground connection, triode Q 3Grounded emitter, triode Q 3Collector electrode be connected with a point, the end of capacitor ICR is connected with the b point, the other end of ICR is connected with a point by key switch ANR.
3, according to claim 1 or 2 described a kind of duplex telephone carriers, it is characterized in that described fm modulation circuit is by integrated circuit (IC) by power line transmission 1, capacitor C 12, C 13, C 14, C 15, C 19, voltage-stabiliser tube D 1, resistance R 18, adjustable resistance W 0, W 1... W 9Form, the dialing frequency selection circuit is by integrated circuit (IC) 2, IC 3, IC 4, IC 5, IC 6, resistance R 24, R 25, R 26, capacitor C 19, key switch AN 0, AN 1AN 9, key switch AN 11Form IC 1Adopt integrated circuit 567, IC 2Adopt NOR gate 4001, IC 3Adopt decades pulse distributor 4017, IC 4, IC 5, IC 6Adopt four bidirectional analog switches 4066, integrated circuit (IC) 2With resistance R 24, resistance R 26, capacitor C 19Form a clock pulse generator, IC 24 pin be output, with integrated circuit (IC) 314 pin connect capacitor C 19Be connected IC 22 pin and 4 pin between, resistance R 26An end and IC 22 pin connect R 26The other end and IC 23,5,6 pin connect IC 214 pin be connected IC with positive source 27,8,9,10,11,12,13 pin ground connection, IC 21 pin be connected resistance R with the f point 24An end be connected R with the f point 24The other end be connected resistance R with positive source 25An end ground connection, R 25The other end and IC 315 pin connect IC 316 pin be connected key switch AN with positive source 11Two ends and IC 315 pin, 16 pin connect IC 31,2,3,4,5,6,7,9,10,11 pin respectively with key switch AN 0, AN 1AN 9An end connect key switch AN 0, AN 1AN 9The other end be connected IC with the f point 38 pin ground connection, IC 31,2,3,4,5,6,7,9,10,11 pin as three analog switch IC of output control 4, IC 5, IC 6, analog switch IC 4, IC 5, IC 6Select adjustable resistance W 0, W 1W 9One of them is connected to IC 15,6 pin between, IC 12 pin be connected capacitor C with the output C that gives emphasizer 12, C 13, C 14, C 15, C 19An end ground connection, their other end respectively with IC 12,1,3,6,4 pin connect IC 17 pin ground connection, IC 14 pin and resistance R 18An end and voltage-stabiliser tube D 1Negative pole connect R 18The other end be connected D with positive source 1Plus earth, IC 15 pin be output, be connected with the input of output amplifier.
CN 91231598 1991-12-02 1991-12-02 Diplex carrier telephone set Granted CN2111600U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 91231598 CN2111600U (en) 1991-12-02 1991-12-02 Diplex carrier telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 91231598 CN2111600U (en) 1991-12-02 1991-12-02 Diplex carrier telephone set

Publications (1)

Publication Number Publication Date
CN2111600U true CN2111600U (en) 1992-07-29

Family

ID=4936781

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 91231598 Granted CN2111600U (en) 1991-12-02 1991-12-02 Diplex carrier telephone set

Country Status (1)

Country Link
CN (1) CN2111600U (en)

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