EP0176526A1 - Installation de transfert de donnees numeriques - Google Patents

Installation de transfert de donnees numeriques

Info

Publication number
EP0176526A1
EP0176526A1 EP19850901369 EP85901369A EP0176526A1 EP 0176526 A1 EP0176526 A1 EP 0176526A1 EP 19850901369 EP19850901369 EP 19850901369 EP 85901369 A EP85901369 A EP 85901369A EP 0176526 A1 EP0176526 A1 EP 0176526A1
Authority
EP
European Patent Office
Prior art keywords
data
light
arrangement according
transmitter
sinks
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.)
Withdrawn
Application number
EP19850901369
Other languages
German (de)
English (en)
Inventor
Peter Joachim Becker
Dirk Heger
Frank Saenger
Peter Peschke
Hermann Bolle
Kym Watson
Walter Heil
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP0176526A1 publication Critical patent/EP0176526A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/43—Arrangements comprising a plurality of opto-electronic elements and associated optical interconnections
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/32—Holograms used as optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4206—Optical features
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
    • H04B10/801—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections
    • H04B10/803—Free space interconnects, e.g. between circuit boards or chips

Definitions

  • the invention relates to an arrangement for transmitting digital data between data sources and data sinks.
  • the data sources and sinks can be, for example, microprocessors, digital memories, input / output devices, but also digital telephone switching systems or other information transmission devices in which data from a multiplicity of data sources are dependent on the respective operating state a large number of data sinks have to be transmitted.
  • HEP Heterogeneous Element Processor
  • connection network which completely networks all data sources with all data sinks.
  • Complete networking is understood here to mean a connection which enables each individual subscriber (data source or data sink) to connect to every other subscriber in accordance with the transmission direction provided for the subscriber, all subscribers to one another can exchange data simultaneously and without mutual interference, provided that the individual subscribers are able to do so due to their technical design.
  • the invention is based on the object of specifying an arrangement for transmitting digital data between data sources and data sinks which, with justifiable technical outlay, enables complete networking between the data sources and data sinks which, on the basis of their function, can exchange data with one another.
  • This object is according to the invention indicated by the nenden kennzeich ⁇ in part of the patent claim 1 solves overall 5: According to the invention the transfer of digital data between data sources and data sinks on op ⁇ zierm ways. For this purpose, the data sources are connected to light transmitters and the data sinks to light receivers.
  • a holographic storage medium is arranged between the light transmitters and light receivers, which ensures that the light of the light transmitter assigned to a specific data source is mapped onto the light receiver or receivers to be addressed in the respective transmission case.
  • the holograms arranged in the holographic storage medium are arranged between the light transmitters and light receivers, which ensures that the light of the light transmitter assigned to a specific data source is mapped onto the light receiver or receivers to be addressed in the respective transmission case.
  • the holograms stored in the holographic storage medium act as switching imaging elements, which open the desired transmission channel between the light transmitters and the light receivers and at the same time prevent light " from light transmitters from striking light receivers, which result in data not addressed" lower belong.
  • ⁇ th holograms determines which light emitters are connected to WEL 30 chen light receivers.
  • Storage medium with other hologram structures can thus in a simple manner - without, for example, 35
  • the holographic storage medium can be at suffi- o c chender angle selectivity, ie with sufficient channel separation save between the individual transmission channels up to 10 ⁇ single holograms "ter optical path Schal ⁇ " 10 * can open communication channels and close.
  • up to _ 10 4 data sources with 10 4 data sinks can be completely networked according to the definition given above, ie the 10 4 data sources can exchange data with all 10 4 data sinks simultaneously and without mutual interference (provided that the individual Data sources and data sinks are able to do this due to their technical design.
  • the production of the individual holograms in the holographic storage medium, which switch the corresponding light paths for connecting the individual data sources to the data sinks, is very simple.
  • In order to store a hologram that contains one or more specific light transmitters with a connecting one or more specific light receivers only co-emitting light transmitters have to be arranged at the locations of these light transmitters and light receivers and the wave field of these light transmitters must be recorded in the respective hologram.
  • the light transmitters used for recording must have a wavelength that drawing process in the storage medium used.
  • a hologram produced in this way has - as follows directly from the theory of holograms - the property of influencing the wave field of a light transmitter, which is substituted for a "recording light transmitter”, in such a way that the wave field emerging from the hologram of the light transmitter is equal to the wave field of the second "recording light transmitter” during the production of the hologram. If one now places a light receiver in the place of the second "recording light transmitter", the wave field of the light transmitter is deflected or diffracted onto the light receiver.
  • the positioning of the storage medium between the light transmitters and light receivers is comparatively uncritical: a parallel offset of the storage medium to the target position is almost irrelevant; Tilting of the storage medium in relation to the target position, however, must be so small that no crosstalk occurs between adjacent channels.
  • tilting may only be of this order of magnitude. Become less than 10 ⁇ *.
  • the arrangement according to the invention for transmitting digital data between data sources and data sinks is thus also suitable for replacing printed circuits in computers etc. with the particular advantage that if the ⁇
  • At least one hologram is stored for each connection required. If more than one hologram is saved for each required connection, replacement transmission channels can also be implemented, e.g. can be used if certain light transmitters and / or receivers are already occupied by the transmission on other transmission channels.
  • the required transmission channel i.e. the connection between a specific data source e and a specific data sink is selected by. that a certain pattern lights up from a certain number of light emitters of the data source. The corresponding transmission path is opened by this pattern.
  • the arrangement according to the invention not only permits the transfer of data between a respective data source and a data sink. Rather, data can also be transmitted between a data source and a series of data sinks or between a series of data sources and a data sink. Furthermore, it is possible to transmit data from one data source to all data sinks or from all data sources to one data sink (claim 6).
  • the ability of the arrangement according to the invention to transmit data from a data source to a series of data sinks 5 can also be used to reduce the number of holograms required and the number of light transmitters and / or receivers: um nevertheless, to enable a transmission between only one data source and one data sink at a time, a control telegram, which is constructed in a manner known per se, is transmitted optically, that of the large number of data sinks whose light receivers receive data due to the transmission channel opened by means of a specific hologram , communicates which data sink is to be specifically addressed
  • Another possibility of reducing the number of light transmitters or light receivers required is to provide only as many light transmitters or light receivers as possible,
  • Claims 10 to 14 specify various possibilities for arranging the light transmitters and light receivers in such a way that no crosstalk occurs between adjacent transmission channels at high packing density.
  • the light transmitters and / or the light receivers are arranged in a cell or on one or more concentric circles, since such an arrangement largely suppresses crosstalk between adjacent channels, which is otherwise due to the three-dimensional height ⁇ logram structure, which acts as a three-dimensional diffraction grating, as well as the occurrence of higher orders.
  • the light yield on the receivers i.e. the efficiency of the transmission can be further increased.
  • any holograms can be used for the arrangement according to the invention.
  • the use of volume holograms is particularly advantageous, since volume holograms have a particularly high angle selectivity. 1 which can reach the order of magnitude of 1/100 ° when using light sources with a large coherence length, such as gas lasers etc. (Claim 17).
  • any photochromic or photorefractive materials such as lithium niobate, lithium tantalate, photoacrylic or dichromate gelatin can be used.
  • Incoherently radiating light sources for example light-emitting diodes
  • the light transmitter can be used as the light transmitter.
  • transmission rates of up to 100 Mbit / s can be achieved without further notice.
  • higher transmission rates, for example 300 Mbit / s can be achieved, for example, by using laser diodes such as pictail diodes (claim 20) as the light transmitter.
  • optical fiber bundles for example glass fibers etc.
  • optical fiber bundles can be used by means of. whose light is directed from the light transmitter with a larger cross-sectional area to the actual exit point or vice versa from the receiving location to the license
  • FIG 3 shows an exemplary embodiment in which the number of light receivers and light transmitters required is reduced.
  • FIG. 1 shows a first exemplary embodiment of the invention, which has a volume holographic system consisting of a storage medium 1, a transmitter matrix 2 and a receiver line 3 for connecting a large number of data sources 4 to data sinks 5.
  • a large number of holograms are stored in the storage medium 1, each of which diffracts the light coming from a specific light transmitter from the transmitter matrix 2 in such a way that it strikes a light receiver in the receiver row 3.
  • This property of the individual holograms is achieved by arranging two "recording light transmitters" at the location of the light transmitter in the transmitter matrix 2 or at the location of the (desired) light receiver in the receiver line 3, and the (coherent) wave field originating from these “recording light transmitters” is recorded in the storage medium 1.
  • the hologram thus generated then has the property of diffracting the light emanating from a light transmitter in the transmitter matrix 2 in such a way that a wave field is created on the "receiver line side" side of the storage medium, the structure of which corresponds to the structure used for the production of the hologram used wave field coincides, in other words the hologram diffracts the light of the light transmitter onto the corresponding one Light receiver.
  • FIG. 1 thus enables a large number of data sources 4 and data sinks 5 to be connected with holographically optical means in such a way that digital data can be transmitted simultaneously and without collision from the data sources to the data sinks.
  • the arrangement shown in Fig. 1 can be improved with respect to its optical efficiency by insertion of optical imaging systems, between the 'sender matrix 2 and the storage medium 1 and between the storage medium 1 and the receiver line 3.
  • the holographic system contains a hologram for each required connection between a data source and a data sink.
  • the transmitter matrix 2 contains as many light transmitters for each data source 4 as data sinks 5 are to be directly addressed by a data source.
  • the receiver line 3 contains for each data sink as many light receivers as data sources which can address the respective data sink directly.
  • the matrix-like arrangement of the light transmitters and the cell-shaped arrangement of the light receivers are causally related to the optical properties of the volume holograms provided here. This not only suppresses higher diffraction orders, but also crosstalk, which would result from the three-dimensional hologram structure and thus the three-dimensional diffraction behavior.
  • the light transmitters can of course also be arranged in a cell shape and the light receivers in a matrix shape or light transmitters and light receivers in a cell shape.
  • the light transmitter and / or. Light receiver also attached to a circle or several concentric circles be classified. The latter arrangement has the advantage that crosstalk is very well suppressed due to higher diffraction orders.
  • the light transmitters and the light receivers can also be of the same type, e.g. preferably arranged in a matrix.
  • Volume holograms have the property that the angular selectivity between adjacent channels is approximately 0.01 °. Since typical storage media for volume holograms are lithium niobate crystals with edge lengths in the order of magnitude of several millimeters, up to 10 ° holograms can be saved with an angular separation that is sufficient for “typical geometries” and used for channel selection. This means that as many connections can be used at the same time.
  • connections can either be bit serial or word serial. In word-serial execution is for everyone
  • Light transmitter a light receiver on the receiver line 3 and a hologram in the holographic system for each combination between data sources and data sinks.
  • Volume holograms are at least 10 °.
  • the matrix 2 and the receiver 3 can ngerzeile * beispiels ⁇ as parent fiber optic bundles are used, in each of which 5 light transmitter and the light receiver a Lichtwel ⁇ used lenleiter. This means that any geometric adaptation of the holographic system to the downstream data sources and data sinks can be carried out.
  • Data sinks and data sources either a completely networked connection network or also connection networks with other addressing patterns can be produced.
  • components 24 which can be both data sources and data sinks.
  • these components can be digital processors, digital memories, digital computers consisting of digital processors and digital memories or input / output elements.
  • these components 24 are referred to as data components.
  • These data components may e.g. have to solve a common data processing task. To do this, they have to match each other according to the needs of
  • the data components 24 are connected both to a transmitter matrix 24 and to a receiver matrix 29.
  • the light coming from the transmitters of the transmitter matrix 22 is from
  • holograms in a first storage medium 21 are deflected onto a receiver line 23.
  • the receiver line 23 is connected via an electrical transmission link 25 to transmitter modules 27 which control a transmitter line 26.
  • the light emanating from the transmitters of the transmitter line 26 is applied to the holograms 35 in a second storage medium 28 1
  • the arrangement according to FIG. 2 works as follows: 5
  • the address of a channel to be controlled is set on the transmitter matrix 22, for example, by a certain light spot pattern lighting up.
  • a channel consists of a receiver which is arranged in the receiver line 23, and the light signal into an - electric signal converting n, which is applied via the downstream transmission path 25 to the electrical transmitter module 27th
  • the transmitter module 27 contains control electronics which, on the basis of control telegrams received via the electrical transmission link 25
  • the destination address of the data sink '24 15 adjust permitted.
  • the arrangement contains several channels of the same type, so that other channels of the arrangement can be used depending on channel assignments for data transmission or on inoperable channels. 0
  • the data exchange can be done in this arrangement
  • the system corresponding to the arrangement can be switched on in that the first data component willing to send communicates its wish for data transfer with the aid of a first collective telegram (telegrams to all other data sources).
  • This first collective telegram has one
  • Data sources are informed of the occupancy of a specific channel. If other data sources in turn want to transmit data, they initiate their transmission process in the same way and choose a channel that is not currently occupied. On the other hand, with the help of the first 1
  • _ legram also means that with a new first group telegram 15 a new destination address can be set on the transmitter line 26 for the next transmission. If several data sinks now want to occupy a straight free channel at the same time, a collision of the document requests occurs. This
  • ⁇ is based on the well-known CSMA / CD method (carrier sense 20 multiple access / collision detection) or a similar one
  • the light transmitters 22, 26 and light receivers 23, 29 can be arranged in a similar manner, for example preferably in a matrix, that optical imaging systems can be used in the first and second holographic systems to improve the efficiency, that the Ver ⁇ Binding can be either bit-serial or word-serial, that groups and group addresses can be defined 35 in each holographic storage medium 21, 28 and that, for example, ordered light wave 1 bundle of conductors can be used to geometrically adapt the first and second holographic systems.
  • the idea of the second arrangement according to the invention is that complete logical networking between a large number of data sources and data sinks is established over a selectable number of physical channels, that the transmission between the data sources and the. Channels are carried out by a first holographic system and the transmission between channels and data sinks is carried out via a second holographic system, and that the selection, assignment and release of the channels is carried out using a protocol by means of control telegrams or methods, such as
  • FIG. 3 shows a modification of the exemplary embodiments shown in FIGS. 1 and 2, in which a "multiple bus system" is used.
  • the holograms stored in the storage medium which is not shown in detail in FIG. 3 influence the light emitted by light transmitters of the assemblies T1-T18 in such a way that it is deflected onto the light receivers of several assemblies. This is due to the punk
  • this idea can also be le transmission etc. ' in which several light transmitters and receivers form a transmission channel.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Optical Communication System (AREA)

Abstract

Installation pour transférer des données numériques entre des sources de données et des collecteurs de données. Les sources de données et les collecteurs de données peuvent par exemple être des groupes modulaires dans des installations de traitement de données, des systèmes de communication téléphonique, etc. Les sources de données (4) possèdent des photoémetteurs (2) et les collecteurs de données (5) des photorécepteurs (3). Entre les photoémetteurs et les photorécepteurs est disposé un support d'enregistrement holographique (1) dans lequel sont enregistrés des hologrammes produits spécialement. La caractéristique de ces hologrammes est d'ouvrir, lors de l'éclairage de photoémetteurs ou de groupes de photorécepteurs, des canaux de transfert entre ces photoémetteurs et ces photorécepteurs. La structure de l'hologramme permet ainsi de déterminer l'affectation des photoémetteurs et des photorécepteurs. Dans un développement avantageux de la présente invention, des éléments de représentation sont en outre prévus entre les photoémetteurs et le support d'enregistrement, respectivement le support d'enregistrement et les photorécepteurs, afin d'améliorer l'efficacité de l'installation.
EP19850901369 1984-03-22 1985-03-22 Installation de transfert de donnees numeriques Withdrawn EP0176526A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843410629 DE3410629A1 (de) 1984-03-22 1984-03-22 Verfahren und anordnung zum uebertragen von digitalen daten zwischen datenquellen und datensenken
DE3410629 1984-03-22

Publications (1)

Publication Number Publication Date
EP0176526A1 true EP0176526A1 (fr) 1986-04-09

Family

ID=6231343

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850901369 Withdrawn EP0176526A1 (fr) 1984-03-22 1985-03-22 Installation de transfert de donnees numeriques

Country Status (4)

Country Link
EP (1) EP0176526A1 (fr)
JP (1) JPS61501673A (fr)
DE (1) DE3410629A1 (fr)
WO (1) WO1985004544A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8701996D0 (en) * 1987-01-29 1987-03-04 British Telecomm Optical space switch
GB8704016D0 (en) * 1987-02-20 1987-04-15 British Telecomm Optical space switch
US4830444A (en) * 1987-12-31 1989-05-16 American Telephone And Telegraph Company, At&T Bell Laboratories Optical switch

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE786436A (fr) * 1971-07-21 1973-01-19 Comp Generale Electricite Dispositif de commutation
DE2206098C3 (de) * 1972-02-09 1980-03-13 Philips Patentverwaltung Gmbh, 2000 Hamburg Koppelfeld für ein Vermittlungssystem von Nachrichtenkanälen, vorzugsweise im optischen Frequenzbereich
FR2295666A1 (fr) * 1974-12-20 1976-07-16 Comp Generale Electricite Central de commutation telephonique
WO1980001028A1 (fr) * 1978-11-08 1980-05-15 Rozenwaig Boris Dispositif de commutation de signaux par des moyens optiques et autocommutateurs comportant ce dispositif

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8504544A1 *

Also Published As

Publication number Publication date
DE3410629A1 (de) 1985-10-03
WO1985004544A1 (fr) 1985-10-10
JPS61501673A (ja) 1986-08-07

Similar Documents

Publication Publication Date Title
DE69028371T2 (de) Verfahren und Vorrichtung zur Ausnutzung der Kommunikationsbandbreite und Zurverfügungstellung eines gemeinsamen Speichers
EP0755616B1 (fr) Reseau de transport a haut pouvoir de transmission pour telecommunications
DE3751616T2 (de) Parallel-Grossrechner.
DE69631055T2 (de) Speicherschnittstelleneinheit, vermittlungssystem mit gemeinsamem speicher und verfahren dazu
DE69632424T2 (de) Server für kontinuierliche Daten und Datentransferschema für mehrfache gleichzeitige Datenzugriffe
DE3231296C2 (fr)
DE112017003704T5 (de) Technologien für verbesserte Speicherabnutzungsverteilung
DE3851945T2 (de) Optische Rückwandverdrahtung.
DE112014003287T5 (de) Dynamische Bildung von symmetrischen Multiprozessordomänen (SMP-Domänen)
DE102012108117A1 (de) Hochverfügbares Rechnersystem, Arbeitsverfahren und dessen Verwendung
DE69432965T2 (de) Netzwerk zum Verbinden mehrerer Knoten durch Verwendung mehreren Kanäle
EP0882267B1 (fr) Unite centrale a multiprocesseur
DE112004002043B4 (de) Verfahren, System und Programm zum Aufbau eines Pakets
DE19733872A1 (de) Hauptvorrichtung mit Programmempfangsfunktion und Verfahren zum Zugreifen auf ein verwaltetes Objekt der Hauptvorrichtung
WO2002071248A2 (fr) Procedes et dispositifs pour mettre en forme et/ou traiter des donnees
DE69228293T2 (de) Paralleles Datenverarbeitungssteuerungssystem
DE69027416T2 (de) Fehlertolerante serielle Anschlusseinheit für entfernte schnelle E/A-Busse
EP0176526A1 (fr) Installation de transfert de donnees numeriques
DE3123448A1 (de) Anordnung zur steuerung des buszugriffs einer vielzahl von einen bus benutzenden einrichtungen in einem mit zumindest einem optischen mischer als passives bussystem aufgebauten netzwerk, insbesondere fuer mehrrechnersysteme
DE10058227A1 (de) Halbleiterspeicherbauelement, Durchlass-/Zwischenspeichereinheit hierfür und zugehöriges Datenübertragungsverfahren
DE19911957C2 (de) Fernkonfigurierbares optisches Kommunikationsnetz
DE69323263T2 (de) Kreuzschienenschalter zum Herstellen Mehrfach-Rückwand-Verbindungs-Topologien in Kommunikationssystemen
DE69224713T2 (de) Kompakte programmierbare optische parallele Verarbeitungsanordnung
DE3324504C1 (de) Verfahren zur Informationsuebertragung zwischen Mikrorechnern in einem dezentralen Prozesssteuersystem,insbesondere fuer Fernsprechanlagen
DE2353325A1 (de) Zwischenleitungsverteilverfahren in mehrstufigen koppelfeldern fuer fernmelde-, insbesondere fernsprechvermittlungsanlagen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB LI LU NL SE

17P Request for examination filed

Effective date: 19860410

17Q First examination report despatched

Effective date: 19880229

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19880912

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SAENGER, FRANK

Inventor name: BOLLE, HERMANN

Inventor name: HEIL, WALTER

Inventor name: BECKER, PETER, JOACHIM

Inventor name: WATSON, KYM

Inventor name: PESCHKE, PETER

Inventor name: HEGER, DIRK