FR2539176A1 - CENTRAL LOCKING SYSTEM FOR MOTOR VEHICLE - Google Patents
CENTRAL LOCKING SYSTEM FOR MOTOR VEHICLE Download PDFInfo
- Publication number
- FR2539176A1 FR2539176A1 FR8319226A FR8319226A FR2539176A1 FR 2539176 A1 FR2539176 A1 FR 2539176A1 FR 8319226 A FR8319226 A FR 8319226A FR 8319226 A FR8319226 A FR 8319226A FR 2539176 A1 FR2539176 A1 FR 2539176A1
- Authority
- FR
- France
- Prior art keywords
- auxiliary
- code word
- transmitter
- actuation
- auxiliary code
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
- G07C2009/00238—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks the transmittted data signal containing a code which is changed
- G07C2009/00253—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks the transmittted data signal containing a code which is changed dynamically, e.g. variable code - rolling code
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
- G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C2209/00—Indexing scheme relating to groups G07C9/00 - G07C9/38
- G07C2209/06—Involving synchronization or resynchronization between transmitter and receiver; reordering of codes
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Lock And Its Accessories (AREA)
- Selective Calling Equipment (AREA)
Abstract
Cette installation, comprenant au moins un émetteur servant de clé et un récepteur servant de serrure pourvues respectivement de moyens de codage et de décodage, comprend un dispositif de codage auxiliaire qui, suivant un code auxiliaire prédéterminé, engendre comme signaux de synchronisation une quantité mu de mots de code auxiliaire différents ordonnés de manière comptable. Un actionnement particulier de l'émetteur déclenche l'émission de l'un de ces mots de code auxiliaire, à savoir, en comptant et en commutant, le x-ième mot de code auxiliaire au x-ième actionnement. L'agencement est choisi de façon qu'un dispositif de décodage auxiliaire du récepteur convertisse, en comptant et en commutant, lors du x-ième actionnement par le mot de code auxiliaire reçu, le mot de code auxiliaire reçu en signal de déverrouillage, qu'il réalise la synchronisation et que, d'autre part, il commute du côté réception (tout comme l'émetteur du côté émission) sur le (x + 1)-ième mot de code auxiliaire et ainsi de suite en recommençant à 1 après x = m.This installation, comprising at least one transmitter serving as a key and a receiver serving as a lock provided respectively with coding and decoding means, comprises an auxiliary coding device which, according to a predetermined auxiliary code, generates as synchronization signals a quantity mu of different auxiliary code words ordered in an accounting manner. A particular actuation of the transmitter triggers the transmission of one of these auxiliary code words, namely, by counting and switching, the x-th auxiliary code word on the x-th actuation. The arrangement is chosen so that an auxiliary decoding device of the receiver converts, by counting and switching, during the x-th actuation by the auxiliary code word received, the auxiliary code word received into an unlock signal, which 'it performs the synchronization and that, on the other hand, it switches on the reception side (just like the transmitter on the transmission side) to the (x + 1) -th auxiliary code word and so on starting again at 1 after x = m.
Description
L'invention concerne une installation de ver-The invention relates to a glass installation.
rouillage central pour un véhicule automobile avec un dis- central rusting for a motor vehicle with a
positif électronique de commande et un dispositif de télé- positive electronic control and a remote control device
commande, le dispositif de télécommande comprenant au moins un émetteur fonctionnant en tant que clé et un récepteur fonctionnant en tant que serrure etde plus, l'émetteur commandé pour le déverrouillage des fermetures du véhicule automobile à verrouillage central émettant un signal et le récepteur délivrant au dispositif électronique de commande de l'installation de verrouillage central une ou plusieurs impulsions électriques Pour empêcher qu'un signal échangé control, the remote control device comprising at least one transmitter operating as a key and a receiver operating as a lock and furthermore, the transmitter controlled for unlocking the locks of the central locking motor vehicle emitting a signal and the receiver delivering to the electronic control device for the central locking installation one or more electrical pulses To prevent an exchanged signal
entre l'émetteur et le récepteur et qui a été lu et repro- between the transmitter and the receiver and which has been read and repro-
duit de manière illicite puisse être utilisé sans difficulté comme double de clé pour le déverrouillage de l'installation illegally used can be used without difficulty as a duplicate key to unlock the installation
de verrouillage central, on a recours à des moyens auxi- central locking, recourse is had to auxiliary means
liaires de l'informatique mis en oeuvre pour le codage et le décodage de signaux A cet effet, l'émetteur est équipé d'un IT links used for coding and decoding signals For this purpose, the transmitter is equipped with a
dispositif de codage qui, conformément à un code prédéter- coding device which, in accordance with a predetermined code-
miné, associe à un signal de déverrouillage une quantité (n) de mots de code différents ordonnés de manière comptable ( 1, 2, x, n) Liactionnement de l'émetteur déclenche mined, associates with an unlock signal a quantity (n) of different code words ordered in an accounting manner (1, 2, x, n) The actuation of the transmitter triggers
l'émission de l'un de ces mots de code, à savoir en comp- the emission of one of these code words, namely in comp-
tant et en commutant le x-ième mot de code au x-ième action- while switching the x-th code word to the x-th action-
nement Le récepteur comprend un dispositif de décodage correspondant au dispositif de codage qui, en comptant et en commutant, convertit lors d'un actionnement synchrone, c'est-à-dire au x-ième actionnement par le x- ième mot de code reçu, précisément le x-ième mot de code en un signal The receiver includes a decoding device corresponding to the coding device which, by counting and switching, converts during synchronous actuation, that is to say on the x-th actuation by the x-th code word received. , precisely the x-th code word in a signal
de déverrouillage pour le dispositif électronique de com- release for the electronic control device
mande et le transmet à celui-ci et ainsi de suite en recom- requests and transmits it to it and so on, recommending
mençant à 1 après x = n Ce système fonctionne aussi long- leading to 1 after x = n This system also works long-
temps qu'il y a synchronisme entre le dispositif de codage et le dispositif de décodage Mais ce synchronisme peut être perturbé par une fausse manoeuvre de l'émetteur Pour la synchronisation du dispositif de codage et du dispositif de décodage en cas d'absence de synchronisme on part du fait que l'émetteur comprend un dispositif de codage auxiliaire supplémentaire qui engendre, par un actionnement particulier, des mots de code auxiliaire qui n'appartiennent pas à la quantité (n) des mots de code différents, que le récepteur possède un dispositif de décodage auxiliaire qui convertit un mot de code auxiliaire reçu en un signal de déverrouillage si auparavant le dispositif de décodage réglé pour la réception d'un x-ième mot de code a reçu un y-ième mot de code (x différent de y), et que, en plus, lors de ce déverrouillage, le dispositif de codage et le dispositif de décodage sont rétablis sur un mot de code initial commun de la chaîne de comptage ( 1, 2,; ox, - n) Tous ces moyens ont fait leurs preuves et rendent fortement improbable, dans le sens mathématique du terme, la possibilité de produire un double de clé par l'écoute et l'enregistrement des signaux time that there is synchronism between the coding device and the decoding device But this synchronism can be disturbed by a false operation of the transmitter For the synchronization of the coding device and the decoding device in the absence of synchronism it is assumed that the transmitter comprises an additional auxiliary coding device which generates, by a particular actuation, auxiliary code words which do not belong to the quantity (n) of the different code words, that the receiver has a auxiliary decoding device which converts an auxiliary code word received into an unlocking signal if previously the decoding device set for the reception of an x-th code word has received a y-th code word (x different from y ), and that, in addition, during this unlocking, the coding device and the decoding device are restored to a common initial code word of the counting chain (1, 2 ,; ox, - n) All these means did their proofs and make it highly improbable, in the mathematical sense of the term, the possibility of producing a key duplicate by listening to and recording signals
emis par la clé ou l'émetteur.issued by the key or the transmitter.
Selon un autre mode de réalisation perfectionné de l'installation de verrouillage central décrite ci-dessus, l'invention a pour objet de compliquer encore la réalisation d'un double de clé par enregistrement des signaux échangés According to another improved embodiment of the central locking installation described above, the object of the invention is to further complicate the production of a duplicate key by recording the signals exchanged
entre l'émetteur et le récepteur.between the transmitter and the receiver.
Selon l'invention, ce but est atteint par le fait que le dispositif de codage auxiliaire comprend, comme signaux de synchronisation conformes à un code auxiliaire prédétermine, une quantité (m) de mots de code auxiliaire différents qui sont ordonnés de manière comptable ( 1, 2, x, n) , un actionnement particulier de l'émetteur déclenchant l'émission de l'un de ces mots de code auxiliaire, à savoir en comptant et en commutant, le x-ième mot-de code auxiliaire au x-ième actionnement, et le dispositif de décodage According to the invention, this object is achieved by the fact that the auxiliary coding device comprises, as synchronization signals conforming to a predetermined auxiliary code, a quantity (m) of different auxiliary code words which are ordered in accounting manner (1 , 2, x, n), a particular actuation of the transmitter triggering the emission of one of these auxiliary code words, namely by counting and by switching, the x-th auxiliary code word at x- th actuation, and the decoding device
auxiliaire convertissant d'une part, en comptant et en com- auxiliary converting on the one hand, counting and com-
mutant, au x-ième actionnement par le x-ième mot de code auxiliaire reçu, le mot de code auxiliaire reçu en un signal de déverrouillage et réalisant la synchronisation-de la manière décrite et que, d'autre part, il commute du côté réception (tout comme l'émetteur du côté émission) sur le (x + 1)-ième mot de code auxiliaire et ainsi de suite en recommençant à 1 après x = m Selon l'invention, le mot de code auxiliaire respectif a également été pris dans une quantité de mots de code réservés spécialement pour la synchronisation et ordonnés de manière comptable comme décrit ci-dessus Cette quantité (m) est explorée pas à pas de telle façon que le mot de code de synchronisation change, mutant, on the x-th actuation by the x-th auxiliary code word received, the auxiliary code word received in an unlocking signal and carrying out synchronization - in the manner described and that, on the other hand, it switches to the side reception (like the transmitter on the transmission side) on the (x + 1) -th auxiliary code word and so on, starting from 1 after x = m According to the invention, the respective auxiliary code word has also been caught in a quantity of code words reserved specially for synchronization and ordered in an accounting manner as described above This quantity (m) is explored step by step in such a way that the synchronization code word changes,
lui aussi, continuellement Lors d'un actionnement particu- He too, continuously During a particular actuation
lier, l'émetteur commute respeetiyement sur le mot de code auxiliaire suivant Lors de la réception de ce mot de code auxiliaire, le récepteur commute, lui aussi, sur le mot de code auxiliaire suivant si le mot de code auxiliaire reçu link, the transmitter switches respeetiyement to the next auxiliary code word Upon reception of this auxiliary code word, the receiver also switches to the next auxiliary code word if the auxiliary code word received
est celui qui aurait du être reçu d'après la chaîne de comp- is the one that should have been received from the chain of account-
tage Il va de soi que dans le cadre de l'invention le dis- tage It goes without saying that in the context of the invention the
positif de codage auxiliaire et le dispositif de décodage auxiliaire doivent être synchronisés En cas d'absence de synchronisme, il est préférable suivant l'invention,qu'après la réception d'au moins un mot de code auxiliaire reçu et appartenant à la quantité (m), le récepteur revienne dans la position d'attente pour la réception du premier mot de code auxiliaire de la chaîne de comptage et que l'émetteur puisse auxiliary coding positive and the auxiliary decoding device must be synchronized In the event of absence of synchronism, it is preferable according to the invention, that after the reception of at least one auxiliary code word received and belonging to the quantity ( m), the receiver returns to the waiting position for reception of the first auxiliary code word of the counting chain and the transmitter can
être ramené par un actionnement spécial, par exemple parti- be brought back by a special actuation, for example parti-
culièrement long ou fréquent, dans la position d'attente especially long or frequent, in the waiting position
pour l'émission de précisément ce premier mot de code auxi- for the emission of precisely this first code word auxi-
liaire Selon le mode de réalisation préféré de l'inyention, l'émetteur comprend un dispositif pour la réduction de la According to the preferred embodiment of the invention, the transmitter includes a device for reducing the
puissance d'émission qui peut être connecté par un action- transmit power which can be connected by an action-
nement spécial et qui réduit la puissance d'émission de which reduces the transmission power by
façon à exclure un enregistrement non observé et non auto- so as to exclude an unobserved and non-self-recording
risé de ces mots de code auxiliaire La puissance d'émis- laughed at these auxiliary code words The power of emission
sion peut être tellement faible que l'émetteur doit être may be so weak that the transmitter must be
placé en quelque sorte contre la vitre du véhicule automo- placed somehow against the window of the motor vehicle
bile équipé de l'installation de verrouillage central si bile equipped with central locking installation if
les antennes réceptrices sont logées dans la vitre. the receiving antennas are housed in the glass.
Claims (3)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833300732 DE3300732A1 (en) | 1983-01-12 | 1983-01-12 | CENTRAL LOCKING SYSTEM FOR A MOTOR VEHICLE |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2539176A1 true FR2539176A1 (en) | 1984-07-13 |
FR2539176B1 FR2539176B1 (en) | 1986-12-26 |
Family
ID=6188067
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8319226A Expired FR2539176B1 (en) | 1983-01-12 | 1983-12-01 | CENTRAL LOCKING SYSTEM FOR MOTOR VEHICLE |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPS59134285A (en) |
DE (1) | DE3300732A1 (en) |
FR (1) | FR2539176B1 (en) |
GB (1) | GB2133073B (en) |
IT (1) | IT1194481B (en) |
SE (1) | SE445570B (en) |
Families Citing this family (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3442356A1 (en) * | 1984-11-20 | 1986-05-28 | Kiekert GmbH & Co KG, 5628 Heiligenhaus | Central-locking system for a motor vehicle |
DE3521570C2 (en) * | 1985-06-15 | 1996-04-11 | Kiekert Ag | Central locking system for a motor vehicle equipped with a remote control device |
DE3624707A1 (en) * | 1985-07-22 | 1987-01-22 | Aisin Seiki | LOCK CONTROL DEVICE FOR VEHICLES |
DE3536378A1 (en) * | 1985-10-11 | 1987-04-16 | Bayerische Motoren Werke Ag | SAFETY DEVICE FOR A MOTOR VEHICLE |
EP0245385A4 (en) * | 1985-11-21 | 1989-04-24 | Australian Elect Pty Ltd | Electro-magnetic lock. |
DE3737468A1 (en) * | 1987-11-05 | 1989-05-24 | Kiekert Gmbh Co Kg | DOOR LOCKING SYSTEM FOR A MOTOR VEHICLE |
JP2534097B2 (en) * | 1988-04-30 | 1996-09-11 | 株式会社アルファ | Remote control lock control device |
DE3840857A1 (en) * | 1988-12-03 | 1990-06-07 | Hella Kg Hueck & Co | Device for the remote control of security devices |
ATE136975T1 (en) * | 1990-05-29 | 1996-05-15 | Microchip Tech Inc | INTEGRATED CIRCUITS, PARTICULARLY FOR USE IN REMOTE CONTROL SYSTEMS |
US6175312B1 (en) | 1990-05-29 | 2001-01-16 | Microchip Technology Incorporated | Encoder and decoder microchips and remote control devices for secure unidirectional communication |
GB2247156B (en) * | 1990-08-23 | 1994-01-12 | Gen Engineering | Improvements in or relating to a retractor for a safety-belt |
JP2807100B2 (en) * | 1991-05-13 | 1998-09-30 | アルプス電気株式会社 | Transceiver |
US6166650A (en) * | 1991-05-29 | 2000-12-26 | Microchip Technology, Inc. | Secure self learning system |
DE4221142C2 (en) * | 1992-06-27 | 1998-02-19 | Kiekert Ag | Central locking system for a motor vehicle |
DE4227887C1 (en) * | 1992-08-22 | 1994-01-05 | Kiekert Gmbh Co Kg | Vehicle remote central door locking system - uses code-timing generators with synchronised code pulse counters in transmitter and receiver for variable code-word recognition. |
DE4238858C1 (en) * | 1992-08-22 | 1994-02-03 | Kiekert Gmbh Co Kg | Centralised locking system for motor vehicle - uses synchronised clock pulse counters in both coder and decoder set to same initial count via random number generator |
ES2070044B1 (en) * | 1992-10-19 | 1997-02-16 | Trw Sipea Spa | REMOTE CONTROL ESPECIALLY FOR A VEHICLE. |
JP2914211B2 (en) * | 1995-03-24 | 1999-06-28 | 住友電装株式会社 | Keyless entry system |
CA2193846C (en) | 1995-05-17 | 2004-02-17 | Bradford L. Farris | Rolling code security system |
US6690796B1 (en) | 1995-05-17 | 2004-02-10 | The Chamberlain Group, Inc. | Rolling code security system |
US6049289A (en) * | 1996-09-06 | 2000-04-11 | Overhead Door Corporation | Remote controlled garage door opening system |
US5862225A (en) * | 1996-12-16 | 1999-01-19 | Ut Automotive Dearborn, Inc. | Automatic resynchronization for remote keyless entry systems |
US6108326A (en) | 1997-05-08 | 2000-08-22 | Microchip Technology Incorporated | Microchips and remote control devices comprising same |
US8422667B2 (en) | 2005-01-27 | 2013-04-16 | The Chamberlain Group, Inc. | Method and apparatus to facilitate transmission of an encrypted rolling code |
US9148409B2 (en) | 2005-06-30 | 2015-09-29 | The Chamberlain Group, Inc. | Method and apparatus to facilitate message transmission and reception using different transmission characteristics |
US10652743B2 (en) | 2017-12-21 | 2020-05-12 | The Chamberlain Group, Inc. | Security system for a moveable barrier operator |
US11074773B1 (en) | 2018-06-27 | 2021-07-27 | The Chamberlain Group, Inc. | Network-based control of movable barrier operators for autonomous vehicles |
US11423717B2 (en) | 2018-08-01 | 2022-08-23 | The Chamberlain Group Llc | Movable barrier operator and transmitter pairing over a network |
US10997810B2 (en) | 2019-05-16 | 2021-05-04 | The Chamberlain Group, Inc. | In-vehicle transmitter training |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4236068A (en) * | 1979-03-29 | 1980-11-25 | Walton Charles A | Personal identification and signaling system |
US4353064A (en) * | 1981-01-14 | 1982-10-05 | Honeywell Inc. | Battery operated access control card |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2824421C2 (en) * | 1978-06-03 | 1985-10-10 | Robert Bosch Gmbh, 7000 Stuttgart | Switching arrangement for operating locking devices and similar safety devices, in particular as theft protection on a motor vehicle |
DE7904797U1 (en) * | 1979-02-21 | 1981-03-12 | Apag Elektronik AG, Grabs, Sankt Gallen | Motor vehicle with a safety device |
DE3244049C2 (en) * | 1982-11-27 | 1986-06-26 | Kiekert GmbH & Co KG, 5628 Heiligenhaus | Central locking system for a motor vehicle |
-
1983
- 1983-01-12 DE DE19833300732 patent/DE3300732A1/en active Granted
- 1983-11-24 SE SE8306488A patent/SE445570B/en not_active IP Right Cessation
- 1983-11-25 IT IT23886/83A patent/IT1194481B/en active
- 1983-12-01 FR FR8319226A patent/FR2539176B1/en not_active Expired
- 1983-12-14 JP JP58234438A patent/JPS59134285A/en active Granted
-
1984
- 1984-01-10 GB GB08400534A patent/GB2133073B/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4236068A (en) * | 1979-03-29 | 1980-11-25 | Walton Charles A | Personal identification and signaling system |
US4353064A (en) * | 1981-01-14 | 1982-10-05 | Honeywell Inc. | Battery operated access control card |
Also Published As
Publication number | Publication date |
---|---|
FR2539176B1 (en) | 1986-12-26 |
SE445570B (en) | 1986-06-30 |
IT1194481B (en) | 1988-09-22 |
SE8306488L (en) | 1984-07-13 |
IT8323886A0 (en) | 1983-11-25 |
DE3300732A1 (en) | 1984-09-20 |
JPH0452350B2 (en) | 1992-08-21 |
SE8306488D0 (en) | 1983-11-24 |
GB2133073A (en) | 1984-07-18 |
GB2133073B (en) | 1987-01-28 |
GB8400534D0 (en) | 1984-02-15 |
JPS59134285A (en) | 1984-08-01 |
DE3300732C2 (en) | 1987-09-03 |
IT8323886A1 (en) | 1985-05-25 |
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