CA1153464A - Magnetic recording and reproducing device - Google Patents
Magnetic recording and reproducing deviceInfo
- Publication number
- CA1153464A CA1153464A CA000329515A CA329515A CA1153464A CA 1153464 A CA1153464 A CA 1153464A CA 000329515 A CA000329515 A CA 000329515A CA 329515 A CA329515 A CA 329515A CA 1153464 A CA1153464 A CA 1153464A
- Authority
- CA
- Canada
- Prior art keywords
- cassette recorder
- sound
- character
- reproducing device
- picture information
- 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.)
- Expired
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 35
- 230000005236 sound signal Effects 0.000 claims abstract description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 241001415395 Spea Species 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B5/00—Electrically-operated educational appliances
- G09B5/06—Electrically-operated educational appliances with both visual and audible presentation of the material to be studied
- G09B5/065—Combinations of audio and video presentations, e.g. videotapes, videodiscs, television systems
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B5/00—Electrically-operated educational appliances
- G09B5/04—Electrically-operated educational appliances with audible presentation of the material to be studied
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/90—Tape-like record carriers
Abstract
ABSTRACT
The invention relates to a magnetic recording and reproducing device which is able to reproduce sound and char-acters/pictures recorded on a magnetic tape simultaneously or selectively. The device includes, a cassette recorder, a mag-netic tape and a processor. On the magnetic tape are recorded digital signals which consist of frequency-modulated control information for the cassette recorder and pre-determined charac-ter/picture information and pre-determined sound signals related to the character/picture information. The processor part con-trols the cassette recorder according to the control information contained in digital signals read out by the cassette recorder and which operates a display part to display according to the character/picture information.
The invention relates to a magnetic recording and reproducing device which is able to reproduce sound and char-acters/pictures recorded on a magnetic tape simultaneously or selectively. The device includes, a cassette recorder, a mag-netic tape and a processor. On the magnetic tape are recorded digital signals which consist of frequency-modulated control information for the cassette recorder and pre-determined charac-ter/picture information and pre-determined sound signals related to the character/picture information. The processor part con-trols the cassette recorder according to the control information contained in digital signals read out by the cassette recorder and which operates a display part to display according to the character/picture information.
Description
The present invention relates to a magnetic recording and reproducing device which makes it possible -to reproduce sound and characters (letters) or pictures related to the sound simultaneously or selectively, by adding a small device to an ordinary cassette recorder used for recording and reproducing sound.
It is well-known that studying efficiency is increased when a magnetic recording and reproducing device of the type mentioned above is used as a studying aid for ~nglish conversat-ion etc., and when characters and pictures related to sound of English conversation are shown on a display part such as a Braun tube of a TV set, accompanying the sound, as in this manner so-called audio-visual studying can be performed.
In order to carry out the audio-visual studying men-tioned above, it is possible to employ conventional video devices, but they have not become popular as studying aids as they are primarily aimed to project so-called motion pictures and aq, for this~reason, the devices themselves as well as their magnetic tapes tend to be expensive.
The object of the present invention is to provide a magnetic recording and reproducing device which realizes audio-visual studying by recording sound and frequency-modulated dig-ital signals on a magnetic tape by means of the conventional cas~ette recorder, controlling the function and the operation of the recorder, basing on the control information contained in the digital signals and putting out sound (audio) to an ordinary spea~er and further by reproducing and showing the character/
picture information in the digi~al signals on a display part such as a domestic TV set, and finally by reproducing sound and characters/pictures related to it synchronously or selectively.
In accordance with a particular embodiment of the invention there is provided a magnetic recording and reproduc-ing device which is able to reproduce sound and characters/
pictures recorded on a magnetic tape simultaneously or selec-tively. The device includes a cassette recorder and a mag-netic tape on which are recorded digital signals. The diyital signals comprise frequency modulated control information for the cassette recorder and predetermined character/pict~re information and predetermined sound signals related to the eharacter/picture information. A processor part controls the cassette recorder according to the control information contained in digital signals read out by the cassette recorder and which operates a display part to display according to the character/picture information.
- la -;~ ~
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The invention will now be described with reference to the accompanying drawings which show a preferred form thereof and wherein:
Figure 1 is a block diagram showing an embodiment of the magnetic recording and reproducing device in accordance with the present invention, and Figure 2 is a pattern diagram showing a recording ex-ample of the above-mentioned device.
Below an embodiment of the present invention is des-cribed in reference to the attached drawings.
In the block diagram of Figure 1 a cassette recorder 1 ~hich is used for ordinary recording and reproducing of sound, is provided with a remote terminal which electrically controls "on" and "off" of the running of a magnetic tape which acts as the recording medium; a speaker switching terminal which puts on and off the output to the speaker, a microphone switching terminal which controls a microphone 2 "on" and "off", and a monitor terminal. A modulating part of a digital signal modul-ator/demodulator 4 is connected to a microphone switching part 3, ~hile a demodulating part thereof is connected to the monitor terminal. The modulator/demodulator converts parallel digital information sent from a processor part 5 into for example a start-stop synchronous serial signal of 600bps and logic "0"
is modulated and magnetized as a frequency oscillation of 2400c/s and then put into the cassette recorder 1 through the microphone terminal to be recorded on the magnetic tape. Logic "1" is modulated and magnetized as a frequency oscillation of 4800c/s and is recorded on the magnetic tape in the same manner as logic "0", In case of reproducing, modulated signals sent out from the monitor terminal is demodulated and series/parallel converted to be sent out to the processor part 5.
~i39~
The processor 5 which is provided with a memory, reads digital information ~ent out from the digital signal modulator/
demodulator 4, and discriminates and decodes the control infor-mation contained in the digital information so as to perform remote control, microphone and speaker switching controls of the cassette recorder 1. In addition, it has a function to store character/picture information contained in the digital informat-ion in its memory and to put it out to the display part 6 by sychronizing it with the sound put out from the speaker of the cassette recorder 1 or in the condition independent from the sound. The display part 6 is composed by a domestic TV set or a monitor TV, and in case of the former desired video is repro-duced and displayed by putting character/picture information in an antenna terminal, whereas in the latter instance it is done by putting the information in a video signal terminal. It is, however, also possible to reproduce the sound in the display part 6.
In order to record on the magnetic tape in the magnetic recording and reproducing device structured as described above, it is necessary to store digital information in the memory of the processor 5 beforehand. Secondly, when the cassette recorder 1 is set at "taping`' or "recording", digital signals from the processor 5 frequency-modulated through the digital signal modulator/demodulator 4, are put into the microphone terminal and entered on the magnetic tape in the same manner as in the case of ordinary sound. The digital signals contain information on time period of the sound to be recorded next, character/
picture information in relation to the same sound as well as control information of the cassette recorder 1 etc. When the digital information of a pre-determined length is recorded, the processor 5 stops transmission of the digital information, and connects the microphone terminal to the sound microphone 2 by the control information mentioned above, are recorded on the magnetic tape. In other wordg, frequency-modulated digital sig-nals and sound signals are recorded alternately on the same track o~ the magnetic tape as shown in Fig. 2, and thus the sound is recorded only for the period of time designated by sound con-tinuation period control information contained in the digital signals.
In order to reproduce each information recorded on the ma~netic tape as described above, the cassette recorder 1 is set at the reproducing mode as in the conventional methods. At this time, the speaker is kept "off" by the instruction ~rom the pro-cessor 5 so that no sound is emitted. After the cassette recor-der 1 reads frequency-modulated digital signals during the rep-roducing mode, the signals are then demodulated at the digital signal modulator/demodulator 4 through the monitor terminal and are sent out to the processor 5. At this time mark signals of 4800c/s continue for a certain period of time in the head part.
After these mark signals, the processor 5 reads the character/
picture information contained in the digital signals to store them in its memory, then reads the end mark of these signals as well as control information such as that related to sound cont-inuation period control which follows the end mark and puts out certain signals to the speaker switching terminal to put the speaker on and to emit sound.
Accordingly, sound signals recorded on the magnetic tape are reproduced by the same tape as in conventional manners, and pre-determined sound is sent out from the speaker. Also, character/picture information stored as described above is syn-chronized with the sound and put out to the display part 6, re-producing and displaying characters and pictures related to thesound. After a pre-determined period of time, the speaker is turned off by the instruction from the processor 5 and trans-mission of character/picture information to the display part 6 is also stopped at the same time. Then, the digital signal read-ing process is resumed and reproducing process is repeated in the same mannerO
With regard to controls of the above-mentioned cassette recorder 1, it is needless to mention tha-t various kinds of con-trols such as stopping, rewinding, quick forwarding, picking out heads or the initial parts of recorded parts as well as select-ing and reproducing of the magnetic tape can be performed bypro~ramming suitable control information in the processor 5 beforehand. Moreover, it is possible to shorten recording inter-vals of the digital signals on the magnetic tape, as digital in-formation such as characters and pictures can record a grea-ter quantit~ of information much faster compared with soundO
Accordingly, if picture/character information recorded between sounds are received in advance at the processor 5 to be stored in its memory, and put out to the display part 6 synchronously with sound, the information and sound can be controlled to be put out at the same speed. Therefore, there is no need to use a sepcial magnetic tape nor a magnetic tape recorder, and rnore-over, it is possible to record digital signals and sound signals alternately on the same track of an ordinary cassette tape and to reproduce them by an ordinary cassette recorder, thus present-ing an advantage that the device can be made economical.
As described above, the present invention ma~es it possible to reproduce sound and characters and pictures related to it recorded on a magnetic tape at a pre-determlned timing by making an effective use of an ordinary cassette recorder and a home TV set. Therefore, when it is em~loyed for example as a studying aid9 it can present an effective method of studying in the so-called audio-visual manner without the conventional ex-pensive video devices.
It is well-known that studying efficiency is increased when a magnetic recording and reproducing device of the type mentioned above is used as a studying aid for ~nglish conversat-ion etc., and when characters and pictures related to sound of English conversation are shown on a display part such as a Braun tube of a TV set, accompanying the sound, as in this manner so-called audio-visual studying can be performed.
In order to carry out the audio-visual studying men-tioned above, it is possible to employ conventional video devices, but they have not become popular as studying aids as they are primarily aimed to project so-called motion pictures and aq, for this~reason, the devices themselves as well as their magnetic tapes tend to be expensive.
The object of the present invention is to provide a magnetic recording and reproducing device which realizes audio-visual studying by recording sound and frequency-modulated dig-ital signals on a magnetic tape by means of the conventional cas~ette recorder, controlling the function and the operation of the recorder, basing on the control information contained in the digital signals and putting out sound (audio) to an ordinary spea~er and further by reproducing and showing the character/
picture information in the digi~al signals on a display part such as a domestic TV set, and finally by reproducing sound and characters/pictures related to it synchronously or selectively.
In accordance with a particular embodiment of the invention there is provided a magnetic recording and reproduc-ing device which is able to reproduce sound and characters/
pictures recorded on a magnetic tape simultaneously or selec-tively. The device includes a cassette recorder and a mag-netic tape on which are recorded digital signals. The diyital signals comprise frequency modulated control information for the cassette recorder and predetermined character/pict~re information and predetermined sound signals related to the eharacter/picture information. A processor part controls the cassette recorder according to the control information contained in digital signals read out by the cassette recorder and which operates a display part to display according to the character/picture information.
- la -;~ ~
`k~
~5;3~
The invention will now be described with reference to the accompanying drawings which show a preferred form thereof and wherein:
Figure 1 is a block diagram showing an embodiment of the magnetic recording and reproducing device in accordance with the present invention, and Figure 2 is a pattern diagram showing a recording ex-ample of the above-mentioned device.
Below an embodiment of the present invention is des-cribed in reference to the attached drawings.
In the block diagram of Figure 1 a cassette recorder 1 ~hich is used for ordinary recording and reproducing of sound, is provided with a remote terminal which electrically controls "on" and "off" of the running of a magnetic tape which acts as the recording medium; a speaker switching terminal which puts on and off the output to the speaker, a microphone switching terminal which controls a microphone 2 "on" and "off", and a monitor terminal. A modulating part of a digital signal modul-ator/demodulator 4 is connected to a microphone switching part 3, ~hile a demodulating part thereof is connected to the monitor terminal. The modulator/demodulator converts parallel digital information sent from a processor part 5 into for example a start-stop synchronous serial signal of 600bps and logic "0"
is modulated and magnetized as a frequency oscillation of 2400c/s and then put into the cassette recorder 1 through the microphone terminal to be recorded on the magnetic tape. Logic "1" is modulated and magnetized as a frequency oscillation of 4800c/s and is recorded on the magnetic tape in the same manner as logic "0", In case of reproducing, modulated signals sent out from the monitor terminal is demodulated and series/parallel converted to be sent out to the processor part 5.
~i39~
The processor 5 which is provided with a memory, reads digital information ~ent out from the digital signal modulator/
demodulator 4, and discriminates and decodes the control infor-mation contained in the digital information so as to perform remote control, microphone and speaker switching controls of the cassette recorder 1. In addition, it has a function to store character/picture information contained in the digital informat-ion in its memory and to put it out to the display part 6 by sychronizing it with the sound put out from the speaker of the cassette recorder 1 or in the condition independent from the sound. The display part 6 is composed by a domestic TV set or a monitor TV, and in case of the former desired video is repro-duced and displayed by putting character/picture information in an antenna terminal, whereas in the latter instance it is done by putting the information in a video signal terminal. It is, however, also possible to reproduce the sound in the display part 6.
In order to record on the magnetic tape in the magnetic recording and reproducing device structured as described above, it is necessary to store digital information in the memory of the processor 5 beforehand. Secondly, when the cassette recorder 1 is set at "taping`' or "recording", digital signals from the processor 5 frequency-modulated through the digital signal modulator/demodulator 4, are put into the microphone terminal and entered on the magnetic tape in the same manner as in the case of ordinary sound. The digital signals contain information on time period of the sound to be recorded next, character/
picture information in relation to the same sound as well as control information of the cassette recorder 1 etc. When the digital information of a pre-determined length is recorded, the processor 5 stops transmission of the digital information, and connects the microphone terminal to the sound microphone 2 by the control information mentioned above, are recorded on the magnetic tape. In other wordg, frequency-modulated digital sig-nals and sound signals are recorded alternately on the same track o~ the magnetic tape as shown in Fig. 2, and thus the sound is recorded only for the period of time designated by sound con-tinuation period control information contained in the digital signals.
In order to reproduce each information recorded on the ma~netic tape as described above, the cassette recorder 1 is set at the reproducing mode as in the conventional methods. At this time, the speaker is kept "off" by the instruction ~rom the pro-cessor 5 so that no sound is emitted. After the cassette recor-der 1 reads frequency-modulated digital signals during the rep-roducing mode, the signals are then demodulated at the digital signal modulator/demodulator 4 through the monitor terminal and are sent out to the processor 5. At this time mark signals of 4800c/s continue for a certain period of time in the head part.
After these mark signals, the processor 5 reads the character/
picture information contained in the digital signals to store them in its memory, then reads the end mark of these signals as well as control information such as that related to sound cont-inuation period control which follows the end mark and puts out certain signals to the speaker switching terminal to put the speaker on and to emit sound.
Accordingly, sound signals recorded on the magnetic tape are reproduced by the same tape as in conventional manners, and pre-determined sound is sent out from the speaker. Also, character/picture information stored as described above is syn-chronized with the sound and put out to the display part 6, re-producing and displaying characters and pictures related to thesound. After a pre-determined period of time, the speaker is turned off by the instruction from the processor 5 and trans-mission of character/picture information to the display part 6 is also stopped at the same time. Then, the digital signal read-ing process is resumed and reproducing process is repeated in the same mannerO
With regard to controls of the above-mentioned cassette recorder 1, it is needless to mention tha-t various kinds of con-trols such as stopping, rewinding, quick forwarding, picking out heads or the initial parts of recorded parts as well as select-ing and reproducing of the magnetic tape can be performed bypro~ramming suitable control information in the processor 5 beforehand. Moreover, it is possible to shorten recording inter-vals of the digital signals on the magnetic tape, as digital in-formation such as characters and pictures can record a grea-ter quantit~ of information much faster compared with soundO
Accordingly, if picture/character information recorded between sounds are received in advance at the processor 5 to be stored in its memory, and put out to the display part 6 synchronously with sound, the information and sound can be controlled to be put out at the same speed. Therefore, there is no need to use a sepcial magnetic tape nor a magnetic tape recorder, and rnore-over, it is possible to record digital signals and sound signals alternately on the same track of an ordinary cassette tape and to reproduce them by an ordinary cassette recorder, thus present-ing an advantage that the device can be made economical.
As described above, the present invention ma~es it possible to reproduce sound and characters and pictures related to it recorded on a magnetic tape at a pre-determlned timing by making an effective use of an ordinary cassette recorder and a home TV set. Therefore, when it is em~loyed for example as a studying aid9 it can present an effective method of studying in the so-called audio-visual manner without the conventional ex-pensive video devices.
Claims (4)
1. A magnetic recording and reproducing device character-ized in being composed to be able to reproduce sound and char-acters/pictures recorded on a magnetic tape simultaneously or selectively, comprising;
a cassette recorder, a magnetic tape on which are recorded digital signals which comprise of frequency-modulated control information for the said cassette recorder and pre-determined character/picture information and pre-determined sound signals related to the said character/picture information, and a processor part which controls the said cassette re-corder according to the said control information contained in digital signals read out by the said cassette recorder and which operates a display part to display according to the said char-acter/picture information.
a cassette recorder, a magnetic tape on which are recorded digital signals which comprise of frequency-modulated control information for the said cassette recorder and pre-determined character/picture information and pre-determined sound signals related to the said character/picture information, and a processor part which controls the said cassette re-corder according to the said control information contained in digital signals read out by the said cassette recorder and which operates a display part to display according to the said char-acter/picture information.
2. A magnetic recording and reproducing device claimed in claim 1 in which the said cassette recorder is composed by an audio cassette recorder.
3. A magnetic recording and reproducing device claimed in claim 1 in which the said display part is composed by a home TV
set or a monitor TV.
set or a monitor TV.
4. A magnetic recording and reproducing device claimed in claim 1 in which the said digital signals and sound signals are recorded alternately on the same track of a magnetic tape, and character/picture information contained in the said digital sig-nals are stored in a memory of the said processor part to be sent out continuously to the said display part only for reprod-ucing time of sound related to the said information.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53-69885 | 1978-06-12 | ||
| JP6988578A JPS54161221A (en) | 1978-06-12 | 1978-06-12 | Magnetic recorder*reproducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1153464A true CA1153464A (en) | 1983-09-06 |
Family
ID=13415641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000329515A Expired CA1153464A (en) | 1978-06-12 | 1979-06-11 | Magnetic recording and reproducing device |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS54161221A (en) |
| CA (1) | CA1153464A (en) |
| DE (1) | DE2923120C2 (en) |
| FR (1) | FR2428881A1 (en) |
| GB (1) | GB2023907B (en) |
| IT (1) | IT1164502B (en) |
| NL (1) | NL7904604A (en) |
| SE (1) | SE7904959L (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57174768A (en) * | 1981-04-17 | 1982-10-27 | Sharp Corp | Information retrieving device |
| GB2102605B (en) * | 1981-05-29 | 1985-12-04 | Sharp Kk | Information retrieval |
| JPS58164383A (en) * | 1982-03-25 | 1983-09-29 | Sony Corp | Video signal recording device |
| JPS59140666A (en) * | 1983-01-31 | 1984-08-13 | Victor Co Of Japan Ltd | Reproducer for rotary recording medium |
| JPH07108025B2 (en) * | 1984-04-09 | 1995-11-15 | ソニー株式会社 | Sound reproduction device with video |
| AU4678085A (en) * | 1984-08-01 | 1986-02-25 | Intraview Systems Corp. | Interactive video and audio controller |
| JPH0376043A (en) * | 1989-08-16 | 1991-04-02 | Asahi Optical Co Ltd | Recording and reproducing device |
| DE4013070A1 (en) * | 1990-04-25 | 1991-10-31 | Pierre Damien Muralt De | Audio-visual teaching equipment - performs simultaneous signal reprodn. from Manchester II coded digital recordings of speech and video information on tape of audio cassette |
| WO2003044779A1 (en) * | 2001-08-07 | 2003-05-30 | Beijing Dvt Technology Co., Ltd | Teletext data generating and encoding method on the audiovisual magnetic tape & the teletext data player |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4040088A (en) * | 1974-01-10 | 1977-08-02 | Rca Corporation | Adaptor for inter-relating an external audio input device with a standard television receiver, and an audio recording for use therewith |
| US4094079A (en) * | 1977-04-05 | 1978-06-13 | Dorsett Educational Systems, Inc. | Single medium audio-visual teaching machine |
| DE2738099A1 (en) * | 1977-08-24 | 1979-03-08 | Koerting Radio Werke Gmbh | Audio-visual language training system - has digital recording representing reproduced spoken text compared with manually entered data |
-
1978
- 1978-06-12 JP JP6988578A patent/JPS54161221A/en active Pending
-
1979
- 1979-06-07 SE SE7904959A patent/SE7904959L/en not_active Application Discontinuation
- 1979-06-07 DE DE2923120A patent/DE2923120C2/en not_active Expired
- 1979-06-08 IT IT23399/79A patent/IT1164502B/en active
- 1979-06-08 GB GB7919980A patent/GB2023907B/en not_active Expired
- 1979-06-11 FR FR7914833A patent/FR2428881A1/en active Granted
- 1979-06-11 CA CA000329515A patent/CA1153464A/en not_active Expired
- 1979-06-12 NL NL7904604A patent/NL7904604A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| DE2923120C2 (en) | 1984-08-30 |
| GB2023907B (en) | 1982-09-08 |
| DE2923120A1 (en) | 1980-01-10 |
| JPS54161221A (en) | 1979-12-20 |
| IT7923399A0 (en) | 1979-06-08 |
| FR2428881B1 (en) | 1982-04-16 |
| GB2023907A (en) | 1980-01-03 |
| SE7904959L (en) | 1979-12-13 |
| NL7904604A (en) | 1979-12-14 |
| FR2428881A1 (en) | 1980-01-11 |
| IT1164502B (en) | 1987-04-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |