JPH0260396A - Extension calling system for telephone set - Google Patents
Extension calling system for telephone setInfo
- Publication number
- JPH0260396A JPH0260396A JP63212944A JP21294488A JPH0260396A JP H0260396 A JPH0260396 A JP H0260396A JP 63212944 A JP63212944 A JP 63212944A JP 21294488 A JP21294488 A JP 21294488A JP H0260396 A JPH0260396 A JP H0260396A
- Authority
- JP
- Japan
- Prior art keywords
- extension
- telephone
- called
- call
- line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005236 sound signal Effects 0.000 claims description 17
- 238000004891 communication Methods 0.000 claims description 4
- 238000012790 confirmation Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Landscapes
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は簡易交換機能を備えた電話装置の内線呼び出し
方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an extension calling system for a telephone device equipped with a simple switching function.
［従来の技術］
電話の多機能化、便利性向上のため電話局からの外線と
の通話以外にドアホン平型との通話、更に内線相互間の
通話を行うための交換機能をもった電話装置が提供され
ている。[Prior art] In order to make telephones more multi-functional and more convenient, a telephone device has an exchange function that allows calls to be made to a flat door phone as well as calls between extension lines in addition to calls from a telephone office to an outside line. is provided.
［発明が解決しようとする課題］
ところが従来の電話装置は内線呼び出しが行われた時に
、被呼び出し側の電話機が例えば外線と通話中であれば
、ビジー音を呼び出し側へ送出するのみで、被呼び出し
側では呼び出されていることが分からないという問題が
あった。[Problems to be Solved by the Invention] However, in conventional telephone devices, when an extension call is made, if the called party's telephone is in the middle of a call, for example, to an outside line, the telephone device only sends a busy tone to the calling party, There was a problem in that the calling side did not know that it was being called.
本発明は上述の問題点に鑑みて為されたちのて、内線呼
び出し時において被呼び出し側の電話機がオフフック状
態であっても、内線呼び出しされていることが被呼び出
し側で分かる電話装置の内線呼び出し方式を提供するこ
とを目的とし、併せて呼び出し側の電話機で被呼び出し
側の電話機の状態が確認できる電話装置の内線呼び出し
方式を提供することを目的とする。The present invention has been made in view of the above-mentioned problems, and provides an extension call for a telephone device that allows the called party to know that an extension call is being made even if the telephone of the called party is off-hook at the time of an extension call. Another object of the present invention is to provide an extension calling system for a telephone device that allows the calling party's telephone to check the status of the called party's telephone.
［課題を解決するための手段］
本発明は外線からの着信があると内線に接続してある電
話機と外線との通話路を、内線に接続した電話機から内
線呼び出しがあると内線通話路を夫々形成する通話制御
手段と、内線呼び出しの呼び出し音信号等の各種音信号
を信号線を介して送出する音声送出手段と、通話制御手
段及び音声送出手段を制御する制御手段とからなる主装
置を備えるとともに、主装置からの内線に対して電話機
に接続する接続手段と、主装置からの信号線に接続され
信号線を介して送出される音信号により鳴動するスピー
カとから少なくとも構成される電話コンセントを備えた
電話装置からなる。[Means for Solving the Problems] The present invention connects the telephone line connected to the extension line to the telephone line when there is an incoming call from the external line, and the telephone line connected to the extension line when the telephone line is connected to the extension line. a main device comprising a call control means for forming a telephone call, a voice transmission means for transmitting various sound signals such as a ring tone signal for an extension call via a signal line, and a control means for controlling the call control means and the voice transmission means. In addition, a telephone outlet consisting of at least a connecting means for connecting an extension line from the main device to a telephone, and a speaker connected to a signal line from the main device and emitting sound signals transmitted via the signal line. consisting of a telephone device equipped with
［作用］
而して、内線呼び出し時に被呼び出し側内線に電話コン
セントの接続手段を介して接続せる電話機がオフフック
されている時には音声送出手段を通じて被呼び出し側内
線に内線呼び出し用の音信号を送出させ、被呼び出し側
の内線に接続されている電話コンセントのスピーカより
内線呼び出しの呼び出し音を報知させ、内線呼び出し中
であることを使用者に知らせるのである。[Function] Therefore, when the telephone connected to the called extension through the telephone outlet connection means when an extension is called is off-hook, a sound signal for calling the extension is sent to the called extension through the audio output means. , the speaker of the telephone outlet connected to the extension on the called side notifies the user that the extension is calling.
また内線呼び出し時に被呼び出し側の電話機がオフフッ
ク状態かオンフック状態かで被呼び出し側の内線に送出
する音信号の種類を変えるとともに、呼び出し側の電話
機を接続した内線に呼び出し中に送出する呼び出し確認
音信号の種類を被呼び出し側の電話機のオンフック状態
かオンフック状態かで変えることにより呼び出し側に被
呼び出し側の電話機の状態を知らせることがてき、また
被呼び出し側ては電話機の使用状況に応じた呼び出し音
を報知することができる。In addition, when an extension is called, the type of sound signal sent to the called party's extension is changed depending on whether the called party's telephone is off-hook or on-hook, and a ring confirmation tone is sent to the extension to which the calling party's telephone is connected during the call. By changing the type of signal depending on whether the called party's telephone is on-hook or on-hook, the calling party can be informed of the status of the called party's telephone, and the called party can make calls according to the usage status of the telephone. Sound can be notified.
［実施例］
第１図は本発明装置を使用したシステムの全体構成図を
示しており、主装置１には切り分は器８と保安器７とを
介して電話局からの外線２を接続し、ドアホン平型３か
らの通話線４を接続し、更に内線５及び制御線６からな
る内部線を接続している。[Embodiment] Fig. 1 shows an overall configuration diagram of a system using the device of the present invention, in which an outside line 2 from a telephone office is connected to the main device 1 via a cutout device 8 and a safety device 7. A telephone line 4 from the flat door phone 3 is connected thereto, and an internal line consisting of an extension line 5 and a control line 6 is further connected thereto.
各内部線には電話コンセント９を夫々接続し、内！！５
に接続された各電話コンセント９のモジュラ−ジャック
１０には一般電話機１１１・・・のコード先端に設けた
あるモジュラ−プラグ１２を着脱自在に接続するように
なっている。Connect the telephone outlet 9 to each internal line, and inside! ! 5
A modular plug 12 provided at the end of a cord of a general telephone 111 is detachably connected to a modular jack 10 of each telephone outlet 9 connected to the telephone.
また電話コンセント９の表面には回線状態を表示するた
めの表示手段の表示素子ＬＥＤＩ，ＬＥＤ２を設けであ
る。Further, on the surface of the telephone outlet 9, display elements LEDI and LED2 are provided as display means for displaying the line status.
第２図は主装置］の回路ブロックを示しており、外線着
信を検出する着信検出部１３と、外線２を保留状態にす
る保留回路１４と、回線状態を示す音信号を作成増幅し
て、制御線６に重畳させる音声送出回路１７と、ドアホ
ン平型３の通話線４や内線５の回線状態を可視表示する
ための電圧信号を作成して制御線６に重畳させる表示制
御回路１８と、外線着信時、外線発呼時、内線呼び出し
時、ドアホン呼び出し時などの各状態に応じて外線２と
内線５、内線５同士、ドアホン平型３の通話線４と内線
５の夫々の接続切り換えを行う通話切り換え回路１６と
、回線状態に応じて上記各回路１３〜１４、１６〜１８
を制御するための主制御回路１５と、各回路１３〜１８
に電源を供給する電源回路１つとから構成される。FIG. 2 shows a circuit block of the main unit, which includes an incoming call detection section 13 that detects an incoming outside line call, a hold circuit 14 that puts the outside line 2 on hold, and a sound signal that creates and amplifies the line status. an audio transmission circuit 17 that is superimposed on the control line 6; a display control circuit 18 that creates a voltage signal for visually displaying the line status of the call line 4 and extension line 5 of the flat door phone 3 and superimposes it on the control line 6; Switch the connections between the outside line 2 and extension 5, between extensions 5 and 5, and between talk line 4 and extension 5 of the flat-type door phone 3, depending on the status such as receiving an outside line, making an outside call, calling an extension, or ringing the doorbell. The call switching circuit 16 to be used and the above-mentioned circuits 13 to 14 and 16 to 18 depending on the line status.
a main control circuit 15 for controlling the circuits 13 to 18;
It consists of one power supply circuit that supplies power to the
第３図は電話コンセント９の回路図を示しており、モジ
ュラ−ジャック１０には内線５を接続し、制御線６には
一斉放送による呼び出しを行うための音声発生回路２０
と、外線話し中表水用の表示素子ＬＥＤ，及び内線話し
中表水用の表示素子ＬＥ Ｄ ２を制御線６に重畳され
る電圧信号により制御する電圧レベル回路２１とを設け
である。FIG. 3 shows a circuit diagram of the telephone outlet 9, in which an extension 5 is connected to the modular jack 10, and a voice generating circuit 20 is connected to the control line 6 for making a call by broadcasting.
and a voltage level circuit 21 for controlling the display element LED for the outside line busy surface and the display element LED 2 for the internal line busy surface by a voltage signal superimposed on the control line 6.
音声発生回路２０は制御線６の２線間に可変抵抗器ＶＲ
と、スピーカＳＰと、直流カット用コンテンサＣ８どの
直列回路を接続して構成される。The audio generating circuit 20 connects a variable resistor VR between two control lines 6.
It is constructed by connecting a series circuit such as a speaker SP and a DC cut capacitor C8.
第４図は電話コンセント９の外観正面図を示しており、
実施例では既製の配線器具の３個モジュール寸法に対応
した取り付は枠２２を一体に設けた器体２３の背面に内
線５及び制御線６を接続する端子部（図示せず）を設け
、表面には蓋付きモジュールジャック１０と可変抵抗器
ＶＲの操作つまみ２４を置設するとともに、スピーカＳ
Ｐの音出し孔２５を開口している。FIG. 4 shows an external front view of the telephone outlet 9.
In this embodiment, the installation of ready-made wiring devices corresponding to the dimensions of three modules is achieved by providing a terminal section (not shown) for connecting the extension line 5 and the control line 6 on the back of the body 23, which is integrally provided with the frame 22. A module jack 10 with a lid and an operation knob 24 for a variable resistor VR are installed on the surface, and a speaker S
The sound output hole 25 of P is opened.
第５図は主装置１全体のプログラムを示しており、図中
の初期化は主制御回路１５内に設けである■／○メモリ
の初期化と、割り込み動作、内蔵タイマの初期を行うル
ーチンであり、入力処理は一般電話機１１．・・のハン
ドセットのオンフック、オフフックの検出処理、外線発
呼、内線呼び出し、保留操作なとのダイヤル入力処理、
更にドアホン平型３からの呼び出し処理を行うルーチン
である。Figure 5 shows the entire program for the main unit 1, and the initialization in the figure is a routine that initializes the ■/○ memory, interrupt operations, and initializes the built-in timer provided in the main control circuit 15. Yes, input processing is done by general telephone 11. Handset on-hook and off-hook detection processing, dial input processing for making external calls, internal calls, and hold operations,
Furthermore, this routine performs call processing from the flat door phone 3.
また出力処理は内線らと外線２との接続、内線５同士の
接続、ドアホン平型３の通話線４と内線５との接続など
を行う接続処理、報知音制御、電話コンセント９の表示
制御からなる出力ルーチンである。In addition, the output processing includes connection processing for connecting extensions and external lines 2, connecting extensions 5 to each other, connecting communication line 4 of flat-type door phone 3 to extension 5, notification sound control, and display control for telephone outlet 9. This is the output routine.
次に本発明方式を用いた実施例回路の内線呼び出し時の
動作を第６図のフローチャートに基づいて説明する。Next, the operation of the embodiment circuit using the method of the present invention when calling an extension will be explained based on the flowchart of FIG.
今、ある電話機１１．から内線呼び出しのダイヤル発信
があると、主制御回路１５は現在被呼び出し側の内線５
に接続されている例えば電話機１１２がオフフックされ
て使用中であるのがどうかを判定し、使用中で無ければ
被呼び出し側に内線呼び出し中であることを報知するた
めの第１の音信号を音声送出回路１７によって作成させ
、この音信号を被呼び出し側の制御線６に重畳送出させ
ると同時に呼び出し中を示すための音信号を音声送出回
路１７で作成して、通話切り換え回路１６を介して呼び
出し側の内線５に重畳送出させる。Now, there is a certain telephone 11. When there is a dial call for an extension call, the main control circuit 15 dials the extension number 5 of the currently called party.
For example, it is determined whether the telephone 112 connected to the telephone 112 is off-hook and in use, and if it is not in use, it sends a first sound signal to notify the called party that the extension is being called. This sound signal is generated by the sending circuit 17, and this sound signal is superimposed and sent to the control line 6 of the called side.At the same time, a sound signal is created by the sound sending circuit 17 to indicate that a call is in progress, and the call is sent via the call switching circuit 16. A superimposed transmission is made to extension 5 on the side.
従って被呼び出し側の電話コンセント９のスピ−カＳＰ
からは内線呼び出しの第１の呼び出し音が報知され、ま
た呼び出し側では電話機１］２のハンドセットのレシー
バ部から発鳴される確認音で、被呼び出し側の電話機１
１２が非使用中であることが分かることになる。Therefore, the speaker SP of the telephone outlet 9 on the called side
The caller will be notified of the first ring tone of the extension call, and the calling party will be notified of the confirmation tone emitted from the receiver of the handset of telephone 1]2, and the called party will be notified of the first ring tone of the extension call.
It can be seen that 12 is not in use.
そして被呼び出し側の電話機１１２のハンドセットが上
げられ、オフフックされると、主制御回路１５は通話切
り換え回路１６を通して被呼び出し側と呼び出し側との
間の内線通話路を形成するとともに、表示制御回路１８
を制御して内線話し中を表示する表示素子Ｌ Ｅ Ｄ
２を点灯させる電圧信号を作成し、各制御線６に印加送
出させる。Then, when the handset of the telephone 112 of the called party is picked up and off-hook, the main control circuit 15 forms an extension communication path between the called party and the calling party through the call switching circuit 16, and the display control circuit 18
A display element LED that controls the extension line and indicates that the extension is busy.
A voltage signal is created to light up the control line 2, and the voltage signal is applied to each control line 6 and sent out.
ところで上記内線呼び出し時に被呼び出し側の電話機１
１２のハンドセットがオフフックされて使用中である場
合には主制御回路１５は音声送出回路１７を制御して非
使用中の内線呼び出し音とは異なる第２の音信号、例え
ば信号レベルを小さくした音信号を作成させ、被呼び出
し側の制御線６に重畳送出させると同時に使用中を示す
ための音色のヒジー信号を音声送出回路］７で作成して
、通話切り換え回路１６を介して呼び出し側の内線５に
重畳送出さぜる。By the way, when the above extension is called, the called party's telephone 1
When the handset No. 12 is off-hook and in use, the main control circuit 15 controls the audio output circuit 17 to output a second sound signal different from the extension ringing tone when the extension is not in use, for example, a sound with a reduced signal level. A signal is created and superimposed on the called side's control line 6. At the same time, a tone-colored low signal to indicate that it is in use is created in the voice transmission circuit] 7, and the signal is sent to the calling side's extension via the call switching circuit 16. It will be sent superimposed on 5.
従って被呼び出し側の電話コンセント９のスピーカＳＰ
からは音量の小さい第２の呼び出し音が報知されて内線
呼び出しがあることを使用者に知らせ、また呼び出し側
では電話機１１２のハンドセットのレシーバ部から発鳴
されるビジー音で、被呼び出し側の電話機１１２が使用
中であることが分かることになる。尚第２の呼び出し音
は第１の呼び出し音と同じ音でも良い。Therefore, the speaker SP of the telephone outlet 9 on the called side
A low-volume second ring tone is alerted to notify the user that there is an extension call, and on the calling side, a busy tone is emitted from the receiver section of the handset of telephone 112 to alert the called party to the telephone. 112 is found to be in use. Note that the second ringing tone may be the same as the first ringing tone.
第７図は内線−斉呼び出しが行える場合のフローチャー
トを示しており、この場合呼び出しをがけな電話機１１
．・・・からのダイヤル信号に基づいて個別の内線呼び
出しか、−斉呼び出しがを主制御回路１５で判定し、−
斉呼び出し時には電話機１１１・・・の使用、非使用に
関係なく各制御線６を通じて各電話コンセント９へ音声
送出回路１７がら音信号を送出させ、各スピーカＳＰで
内線呼び出し音を報知させる。FIG. 7 shows a flowchart for a case where extension-to-all call is possible;
．． The main control circuit 15 determines whether it is an individual extension call or a general call based on the dial signal from...
At the time of simultaneous ringing, a sound signal is sent from the voice sending circuit 17 to each telephone outlet 9 through each control line 6 regardless of whether the telephone set 111 is used or not, and each speaker SP is made to announce an extension ringing tone.
もし個別内線呼び出し時には第６図のフローチャ−トと
同様な処理がなされる。If an individual extension call is made, a process similar to that shown in the flowchart of FIG. 6 is performed.
［発明の効果］
本発明は上記のように構成した電話装置において、内線
呼び出し時に被呼び出し側内線に電話コンセントの接続
手段を介して接続せる電話機がオフフックされている時
には音声送出手段を通して被呼び出し側内線に内線呼び
出し用の音信号を送出させ、被呼び出し側の内線に接続
されている電話コンセントのスピーカより内線呼び出し
の呼び出し音を報知させるから、被呼び出し側の電話機
が使用中であっても、被呼び出し側の使用者に内線呼び
出し中であることを知らせることができできるという効
果がある。[Effects of the Invention] The present invention provides a telephone device configured as described above, which connects to the called party's extension through a telephone outlet connection means when making an extension call, and when the telephone is off-hook, connects to the called party's extension through the voice sending means. The extension sends out a sound signal for calling the extension, and the speaker of the telephone outlet connected to the called party's extension announces the ring tone for the extension call, even if the called party's telephone is in use. This has the effect that it is possible to notify the user on the called side that the extension is being called.
また内線呼び出し時に被呼び出し側の電話機がオフフッ
ク状態かオンフック状態かで被呼び出し側の内線に送出
する音信号の種類を変えるとともに、呼び出し側の電話
機を接続した内線に呼び出し中に送出する呼び出し確認
音信号の種類を被呼び出し側の電話機のオンフック状態
かオンフック状態かで変えることにより呼び出し側に被
呼び出し側の電話機の状態を知らせることができ、しが
も被呼び出し側の電話機の使用状況に応じた呼び出し音
を報知させることがてきるから、使用勝手を向上させる
ことができるという効果がある。In addition, when an extension is called, the type of sound signal sent to the called party's extension is changed depending on whether the called party's telephone is off-hook or on-hook, and a ring confirmation tone is sent to the extension to which the calling party's telephone is connected during the call. By changing the type of signal depending on whether the called party's telephone is on-hook or on-hook, it is possible to inform the calling party of the status of the called party's telephone, and it is possible to notify the calling party of the status of the called party's telephone, and it is possible to change the signal depending on the usage status of the called party's telephone. Since the ringing tone can be notified, there is an effect that usability can be improved.
第１図は本発明の実施例の全体構成図、第２図は同上の
主装置の回路図、第３図は同上の電話コンセントの回路
図、第４図は同上の電話コンセントの正面図、第５図は
同」二の主装置のプログラノ＼説明図ｆ、第β図は同上
の内線呼び出し時のフローチャート、第７図は同上の内
線呼び出し時の別の例のフローチャートである。
１は主装置、２は外線、５は内線、６は制御線、９は電
話コンセント、１０はモジュラ−ジャック、１１１・・
・は一般電話機、１７は音声送出回路である。
代理人 弁理士 石 １）長 七FIG. 1 is an overall configuration diagram of an embodiment of the present invention, FIG. 2 is a circuit diagram of the main device shown above, FIG. 3 is a circuit diagram of a telephone outlet same as the above, and FIG. 4 is a front view of the telephone outlet same as the above. FIG. 5 is an explanatory diagram f of the program program of the main unit in the same example, FIG. 1 is the main device, 2 is an outside line, 5 is an extension line, 6 is a control line, 9 is a telephone outlet, 10 is a modular jack, 111...
. is a general telephone set, and 17 is a voice transmission circuit. Agent Patent Attorney Ishi 1) Choshichi
Claims (2)
機と外線との通話路を、内線に接続した電話機から内線
呼び出しがあると内線通話路を夫々形成する通話制御手
段と、内線呼び出しの呼び出し音信号等の各種音信号を
信号線を介して送出する音声送出手段と、通話制御手段
及び音声送出手段を制御する制御手段とからなる主装置
を備えるとともに、主装置からの内線に対して電話機に
接続する接続手段と、主装置からの信号線に接続され信
号線を介して送出される音信号により鳴動するスピーカ
とから少なくとも構成される電話コンセントを備えた電
話装置において、内線呼び出し時に被呼び出し側内線に
電話コンセントの接続手段を介して接続せる電話機がオ
フフックされている時には音声送出手段を通じて被呼び
出し側内線に内線呼び出し用の音信号を送出させること
を特徴とする電話装置の内線呼び出し方式。(1) Call control means for forming a communication path between a telephone connected to an extension and the external line when an incoming call is received from an external line, and an extension communication path when an extension call is received from a telephone connected to the extension; The main device includes a voice transmitting means for transmitting various sound signals such as a ring tone signal via a signal line, and a control means for controlling the call control means and the voice transmitting means. In a telephone device equipped with a telephone outlet consisting of at least a connecting means for connecting to a telephone via a telephone, and a speaker connected to a signal line from the main device and emitted by a sound signal transmitted via the signal line, when an extension is called, Extension calling of a telephone device, characterized in that when the telephone connected to the called extension through a telephone outlet connection means is off-hook, a sound signal for calling the extension is sent to the called extension through the voice sending means. method.
ック状態かオンフック状態かで被呼び出し側の内線に送
出する音信号の種類を変えるとともに、呼び出し側の電
話機を接続した内線に呼び出し中に送出する呼び出し確
認音信号の種類を被呼び出し側の電話機のオンフック状
態かオンフック状態かで変えることを特徴とする請求項
１記載の電話装置の内線呼び出し方式。(2) When an extension is called, the type of sound signal sent to the called party's extension is changed depending on whether the called party's telephone is off-hook or on-hook, and a call is sent to the extension to which the calling party's telephone is connected during the call. 2. The extension calling system for a telephone device according to claim 1, wherein the type of confirmation tone signal is changed depending on whether the telephone of the called party is in an on-hook state or an on-hook state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63212944A JPH0260396A (en) | 1988-08-26 | 1988-08-26 | Extension calling system for telephone set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63212944A JPH0260396A (en) | 1988-08-26 | 1988-08-26 | Extension calling system for telephone set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0260396A true JPH0260396A (en) | 1990-02-28 |
Family
ID=16630881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63212944A Pending JPH0260396A (en) | 1988-08-26 | 1988-08-26 | Extension calling system for telephone set |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0260396A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01270953A (en) * | 1988-04-21 | 1989-10-30 | Babcock Hitachi Kk | Vertical roller mill |
| JPH04170835A (en) * | 1990-11-05 | 1992-06-18 | Rohm Co Ltd | Telephone set |
| JPH04105748U (en) * | 1991-02-25 | 1992-09-11 | 松下電工株式会社 | home telephone switching system |
-
1988
- 1988-08-26 JP JP63212944A patent/JPH0260396A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01270953A (en) * | 1988-04-21 | 1989-10-30 | Babcock Hitachi Kk | Vertical roller mill |
| JPH04170835A (en) * | 1990-11-05 | 1992-06-18 | Rohm Co Ltd | Telephone set |
| JPH04105748U (en) * | 1991-02-25 | 1992-09-11 | 松下電工株式会社 | home telephone switching system |
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