DE10034594B4 - Dental treatment light - Google Patents

Dental treatment light

Info

Publication number
DE10034594B4
DE10034594B4 DE10034594A DE10034594A DE10034594B4 DE 10034594 B4 DE10034594 B4 DE 10034594B4 DE 10034594 A DE10034594 A DE 10034594A DE 10034594 A DE10034594 A DE 10034594A DE 10034594 B4 DE10034594 B4 DE 10034594B4
Authority
DE
Germany
Prior art keywords
light
led
characterized
dental treatment
light field
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.)
Active
Application number
DE10034594A
Other languages
German (de)
Other versions
DE10034594A1 (en
Inventor
Peter Frey
Dieter Petruch
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.)
Sirona Dental Systems GmbH
Original Assignee
Sirona Dental Systems GmbH
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 Sirona Dental Systems GmbH filed Critical Sirona Dental Systems GmbH
Priority to DE10034594A priority Critical patent/DE10034594B4/en
Publication of DE10034594A1 publication Critical patent/DE10034594A1/en
Application granted granted Critical
Publication of DE10034594B4 publication Critical patent/DE10034594B4/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00Refractors for light sources
    • F21V5/02Refractors for light sources of prismatic shape
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00Refractors for light sources
    • F21V5/04Refractors for light sources of lens shape
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/0008Reflectors for light sources providing for indirect lighting
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00Refractors for light sources
    • F21V5/007Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/20Lighting for medical use
    • F21W2131/202Lighting for medical use for dentistry
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00Planar light sources
    • F21Y2105/10Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2107/00Light sources with three-dimensionally disposed light-generating elements
    • F21Y2107/10Light sources with three-dimensionally disposed light-generating elements on concave supports or substrates, e.g. on the inner side of bowl-shaped supports
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2113/00Combination of light sources
    • F21Y2113/10Combination of light sources of different colours
    • F21Y2113/13Combination of light sources of different colours comprising an assembly of point-like light sources
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

Abstract

dental Treatment light which means for generating a light field (7) in an object plane of a given size, illuminance, uniformity and color temperature, characterized in that the light source consists of several adjacently arranged LED's (1), wherein a first part of the LED's generates light spots (17) which are in the object plane (6) form a first light field (7), and wherein a further part of the LED's light spots (17 ') is generated, the second Form the light field (7 '), wherein the first light field (7) for a uniform, glare-free Illumination of the oral cavity Completely embedded in the second light field (7 ').

Description

  • technical area
  • The Invention relates to a dental Treatment light for generating a light field with predetermined Properties. By means of a dental treatment light a light field is to be generated, which is the patient's oral cavity for the practitioner optimally illuminates and does not dazzle the patient. The optical Requirements of the generated light field are in DIN EN 9680 established.
  • since long become dental Treatment lights with a lighting fixture made of a halogen lamp offered, wherein the light emerging from the lighting body via a reflector is directed to a light field. These lamps are because of the relatively high power mostly to high-pressure halogen lamps, the for the free operation are not suitable and therefore in an explosion-proof casing need to be installed. These are the luminaire housing and the glass tube. by virtue of their relatively high operating heat development In general, a fan for cooling the lamp and the housing is necessary.
  • The Reflectors are made of glass and reflective on the Side provided with a transmission coating which ensures that the heat share of the light unreflective on the back of the reflector radiates. Furthermore the reflected light component is reduced so that in the light field a color temperature of 3,600 to 6,500 K, within the specified Limits of the standard color chart is reached.
  • adversely is in addition to the high operating heat development with the requirement of constant cooling by means of a fan the short life of about 2,000 hours, a regular exchange of the lighting fixture during the Lifespan of the treatment light makes necessary.
  • Out US 6,033,087 A it is known to use LEDs to illuminate a surface that can be picked up by a video camera. The annularly arranged around the camera LED's is preceded by a converging lens and a prism, whereby the light emerging from the LED's beams are deflected and focused on a common central area. The spots of light emerging from the individual LEDs beams overlap here.
  • Out US 6,019,493 A is the use of LED's for use in traffic lights known, with a normally used light bulb is replaced by a use LED's use. The LEDs are covered by lenses.
  • From the DE 198 15 868 C2 is a light source for signal lights for railway traffic known in the first LED's are provided with substantially parallel to each other arranged Hauptabstrahlrichtung and second LED's with respect to the main emission of the first LED's inclined emission direction. The first LEDs may have a highly concentrated emission characteristic whose opening angle α is in the range of 1 to 5 °. The light cones of the individual LEDs can overlap.
  • From the DE 198 37 224 A1 a luminaire is known, which serves for signaling as well as marking and marking of traffic areas. In this luminaire, the light generated by the LEDs is reflected on a surface before exiting the luminaire.
  • From the DE 296 20 583 U1 It is also known to add colored light from LEDs to a white light source produced by means of an incandescent lamp, the brightness of which can be adjusted.
  • The The object of the invention is a dental treatment light to provide, with the above-described disadvantages be avoided.
  • presentation the invention
  • According to the invention If the light source consists of several adjacently arranged LED's. The size and even illumination of the Light field is due to the staggered arrangement of the individual light cone every LED generates. The light field can be adjusted so precisely that a Blinding the patient's eyes is prevented. The light emitted by the LEDs is used either directly or indirectly via a reflector. Under Indirect lighting is understood as lighting in which the beam path at least once reflected on a reflector becomes. In direct lighting, the beam path is not reflected, but can be broken for the purpose of alignment, so be redirected.
  • About the Number of LEDs used the corresponding illuminance is achieved. By means of pulse width modulation and / or the connection and disconnection of individual LED, it is possible to illuminance to adjust the treatment light.
  • All in all is the use of LEDs This is advantageous in that the life of LEDs, which is about 100,000 Hours, essentially over the lifetime of halogen lamps is about 2,000 hours, i. an exchange of the lighting fixture is over the entire life of the treatment light is no longer necessary. About that can out the LEDs are operated freely and not have to in explosion-proof enclosures be installed. After all is due to the low heat of operation a cooling, the For example, by means of a fan, not required.
  • to bundling or expansion of the beam path and / or alignment of the beam path to the appropriate light field size can be any LED or group of several LED's optical Be associated with components, such as a converging lens for bundling and a prism for deflecting the beam path. Also the use of apertures is conceivable, although due to the shadowed Part of the beam path, the illuminance is not optimally utilized.
  • advantageously, have the LEDs an emission angle less than 8 °. This can be due to optical Components for bundling the beam path can be dispensed with.
  • advantageously, For example, each LED or group of multiple LEDs is an optical device for alignment associated with the beam path on the light field, creating a light field can be produced with precisely defined properties. As optical Component comes here in particular a prism in question.
  • According to one Further education are the LEDs so arranged that the beam path of each individual LED on the light field is aligned. The LEDs are at an angle to the central axis aligned, with the angle with the distance of the LED's to the central axis increases. The use of additional prisms is in this Case not required.
  • advantageously, are in the beam path of each LED a converging lens for focusing the Light cone arranged on the light field size.
  • Also In this case, the use of a convergent lens can be dispensed with when the LEDs are on Beam angle smaller than 8 ° have.
  • advantageously, is a housing with an at least partially translucent cover available, wherein in the cover, if necessary, the required optical Components such as lenses and / or prisms are incorporated. The cover can be designed as an injection molded part, in the case of glass also as pressed glass part.
  • In An advantageous development is the dental treatment light for the indirect lighting is formed by being on the opposite side of the light field Side of the LED's a reflector is arranged, which emits the rays emerging from the LEDs focused on the illuminated field. It can be between the LEDs and the light field arranged an at least partially translucent cover be. The advantage of this construction is that possibly failed LED's by the user can not be recognized and thus can not attract attention.
  • advantageously, be LED's with a color temperature of 3600 to 6500 K within the light color coordinates of in the limit values of the standard color chart specified in DIN EN 98680.
  • advantageously, the LEDs shine White light from. About that It is also possible the color temperature of the light over the combination of colored, especially red, green and blue LED's too generate to adjust the spectral range of the light.
  • Finally is it is beneficial, white Light emitting LEDs to combine with colored light emitting LED's to the high color temperature of white Lower LED's and warmer To receive light.
  • by virtue of the narrow spectral light range in LEDs is the heat development in the light field very low. Infrared or UV radiation is also not generated.
  • advantageously, are several LEDs arranged on a common board. As a result, a cost-effective production and assembly possible.
  • to Avoidance of optical means for alignment of the LED outgoing light cone can the LEDs on one plane board to the light field to be aligned or the board bent be.
  • advantageously, emits the dental treatment light the light directly from, so that the outgoing of the LED beam path is not reflected. This allows almost the entire surface of the Treatment light for the light generation will be used.
  • The illuminance of the light field can also be switched on and off by a variable Number of LEDs changed without changing the color temperature of the light.
  • According to one advantageous development can the LED's generated light cone be formed so that the light field itself essentially completely covering each other Has light spots. The light field can also only such be constructed.
  • A another way is to make the light beams generated by the LEDs so that the light field at most partially overlapping Has light spots. The light field can also only here in such a way be constructed.
  • Brief description of the drawing
  • embodiments The invention are illustrated in the drawing. It shows the
  • 1 a section through a dental treatment light with arranged on a board LED's
  • 2 another embodiment with narrow emitting LED's
  • 3 a further embodiment with aligned to the light field LED's on a curved board
  • 4 an embodiment of the indirect lighting with a reflector
  • 5 an overall view of the dental treatment light in its pivoting device
  • 6 a perspective view of the dental treatment lamp with a round light field
  • 7 a perspective view of the dental treatment lamp with an oval light field
  • 8th a perspective view of the dental treatment lamp with a built up from several transversely only partially overlapping round light spots light field
  • 9 a perspective view of the dental treatment lamp with a built up from several in the transverse and longitudinal direction only partially overlapping round light spots light field.
  • embodiments the invention
  • In 1 is a dental treatment light with direct beam path shown by the white LED's 1 conventional or SMD type are provided for generating light. The light emerging from the LEDs is transmitted via an optical system 2 made of lens and / or prisms 2 bundled and aligned. The LEDs are on a flat board 3 within a housing 4 accommodated. By the combination of colored LEDs 5 For example, red, green and blue, a total white light can also be generated.
  • The treatment light is at a distance a to an object plane 6 arranged on which a light field 7 must be provided with a predetermined size d and a given illuminance, uniformity and color temperature. That from the LED 1 in a ray cone 8th emitted light is in a lens 9 bundled and in a prism 10 deflected so that the beam path 11 the light field arranged at the distance a 7 incident. The beam path shown 11 results for a edge arranged LED, another beam path 12 results for one in the area of a central axis 13 arranged LED, with the beam paths 11 . 12 in one area 14 near the light field 7 overlap. The lens prism system 2 consisting of the lens 9 and the prism 10 is aligned with the respective opposite LED, with all optical systems 2 on a common lens 15 are arranged, which may be made for example as an injection molded part and the housing 4 to the light field 7 closes. The light field 7 facing surface is flat and also smooth for the purpose of facilitated cleaning beyond. Also the LED's 1 carrying board 3 is just.
  • The optical components can also be used on the light field 7 opposite side of the lens 15 be arranged, both directly connected to the lens or integrated into this as well as be formed as separate components and / or groups of components, which are used together with the lens.
  • From the schematic representation of the beam path 11 in 1 it turns out that the out of the edge LEDs 1 in a cone of light 8th Emerging light rays must be deflected stronger than those closer to the central axis 13 arranged LED's, which is done by a prism. The bundling of the light cone 8th As a result, the light cone striking the object plane at the distance a 11 not over the light field 7 protrudes.
  • In 2 is a modified form of the optical system 2 shown which only prisms 10 and has no lenses. This is possible if the radiation angle is at most 8 °, so that an additional Bün delung of the LED 1 emerging beam cone 8th is not required. By an appropriate alignment of the LEDs on the board 3 could be on the prisms 10 be dispensed with, causing the diffuser 15 a pure cover will be.
  • Regarding the lens 15 is to be understood that this may be made of polycarbonate, glass or other transparent material, wherein the optical system 2 instead of on the case 4 facing inside of the lens 15 also independent of the lens 15 can be arranged in front of each individual LED or groups of LEDs.
  • In 3 A dental treatment light is shown in which the LED's 1 . 5 on a curved board 3 are arranged, with the curvature of the board 3 such is that the beam path 11 . 12 is aligned with the light field without the use of prisms. The optical system 2 consists in the case shown only of the lenses 9 for bundling the out of the LED 1 emerging beam cone 8th , If LED's with a sufficiently small beam angle, that is used at most 8 °, can be applied to the lens 9 be waived. Is the use of a lens 9 required, so can also a curved, concentric to the board lens 15 as a carrier for the lenses 9 be used to provide each LED the appropriate lens and thus bundling.
  • In 4 is a dental treatment light with indirect beam path, in which the light from an LED 1 as a light cone 8th leaking light over a reflector 16 is bundled and reflected. The reflector 16 is to the light field 7 protected by a cover. The principal difference of this embodiment is that the LEDs are not directly on the light field 7 but a reflector, comparable to conventional treatment lights. The LEDs 1 are in a narrow area around the central axis 13 arranged around to those from the LED's 1 emerging light rays 8th not to shade. Indirect lighting does not cause LED's to emit light.
  • In 5 is shown a perspective, partially broken view of a dental treatment light. The housing 4 a corner is broken, causing the view of the board 3 with the LED's arranged on it 1 is released. The diffuser 15 and the board 3 are just trained, a focus of the LED's 1 emerging light cone takes place through the housing interior facing prisms and lenses.
  • These dental Treatment light can be aligned by means of handles in a known manner.
  • In 6 becomes the illuminated area in the object plane 6 by superimposing individual light spots caused by one LED each 17 generated. At a beam angle of the light cone 11 . 12 of approximately 8 ° results in the distance of 700 mm for each LED, a light field with a diameter of about 100 mm.
  • In 7 becomes the illuminated area in the object plane 6 also by superimposing the individual light spots 17 ' which are changed in shape by corresponding optical components mounted in front of each LED, so that an elliptical light field results. It goes without saying that also other light field shapes can be realized.
  • In 8th becomes the light field 7 in the object plane 6 by juxtaposing individual round spots of light 17 Each LED generates, with the light spots 17 partially overlap to achieve a uniform illumination. The light field is thus made up of several round light spots which only partly overlap in the transverse direction 17 built up. In this type of light field generation have the light cone 12 a beam angle of about 8 ° to achieve a light field width of about 100 mm. The light field 7 has an area here 18 with increased illuminance.
  • In 9 becomes the light field 7 in the object plane 6 by juxtaposition and superimposition of the individual light spots 17 generated, with these also overlap accordingly to achieve a uniform illumination. In this type of illumination, the light cones have a much smaller beam angle to order the light spots also one above the other in the light field can. The light field is made up of several round light spots which only partly overlap in the transverse and longitudinal direction. The light field 7 In this case, it is possible to have different areas with different illuminance, as shown, but also by a correspondingly aligned light cone a large area in a substantially constant illuminance.
  • Also the combination of in the 6 - 9 described possibilities of light field generation is possible in order to optimize the uniformity of the illumination according to the respective requirements.

Claims (21)

  1. Dental treatment light which means for generating a light field ( 7 ) in an object plane having a predetermined size, illuminance, uniformity and color temperature, characterized in that the light source consists of a plurality of adjacent LED's ( 1 ), wherein a first part of the LED's light spots ( 17 ) generated in the object plane ( 6 ) a first light field ( 7 ), and wherein another part of the LED's light spots ( 17 ' ), which generates a second light field ( 7 ' ), wherein the first light field ( 7 ) for even, glare-free illumination of the oral cavity completely into the second light field ( 7 ' ) is embedded.
  2. Dental treatment lamp according to claim 1, characterized in that for the bundling or widening of the beam path and / or for the alignment of the beam path ( 8th ) to the corresponding light field size of each LED ( 1 ) or a group of several LED's optical components ( 9 . 10 ) assigned.
  3. Dental treatment light according to claim 1, characterized in that the LEDs ( 1 ) have an emission angle less than 8 degrees.
  4. Dental treatment lamp according to claim 3, characterized in that each LED ( 1 ) a prism ( 10 ) for the alignment of the beam path ( 8th ) is assigned to the light field.
  5. Dental treatment lamp according to one of claims 1 to 4, characterized in that the LED's ( 1 ) are arranged so that the beam path ( 8th ) of each individual LED is aligned with the light field.
  6. Dental treatment lamp according to claim 5, characterized in that in the beam path each LED ( 1 ) at least one lens ( 9 ) is arranged for focusing on the light field size.
  7. Dental treatment lamp according to claim 5, characterized in that the LEDs ( 1 ) have an emission angle less than 8 degrees.
  8. Dental treatment lamp according to one of claims 1 to 7, characterized in that a housing ( 4 ) with an at least partially translucent cover ( 15 ) is available.
  9. Dental treatment lamp according to claim 8, characterized in that the cover plate, the required optical components ( 9 . 10 ) having.
  10. Dental treatment lamp according to claim 8 or 9, characterized in that the cover ( 15 ) is designed as an injection molded part.
  11. Dental treatment lamp according to claim 1, characterized in that on the light field ( 7 ) opposite side of the LED's ( 1 ) a reflector ( 16 ) is arranged, which from the LED's ( 1 ) emitted rays focused on the light field
  12. Dental treatment lamp according to claim 11, characterized in that between the LED's ( 1 ) and the light field, an at least partially translucent cover is arranged.
  13. Dental treatment light according to one of claims 1 to 12, characterized in that the LEDs ( 1 ) have a color temperature of 3,600 to 6,500 K within the light color coordinates of the limit values of the standard color chart defined in DIN EN 9860.
  14. Dental treatment light according to claim 13, characterized in that the LEDs ( 1 ) emit white light.
  15. Dental treatment lamp according to claim 13, characterized in that the color temperature of the light via the combination of colored, in particular red, green and blue LED's ( 5 ) is produced.
  16. Dental treatment light according to claim 13, characterized in that white light emitting LEDs ( 1 ) with colored light emitting LEDs ( 5 ) be combined.
  17. Dental treatment lamp according to one of claims 1 to 16, characterized in that a plurality of LEDs ( 1 . 5 ) on a common board ( 3 ) are arranged.
  18. Dental treatment lamp according to claim 17, characterized in that the board ( 3 ) is curved.
  19. Dental treatment lamp according to one of claims 1 to 18, characterized in that the of the LED's ( 1 ) outgoing beam path is emitted directly.
  20. dental Operating light according to one of Claims 1 to 19, characterized that single LED's or a group of multiple LEDs separately from the other switched on and off are.
  21. Dental treatment light according to one of claims 1 to 20, characterized in that the light cone generated by the LED's ( 11 . 12 ) are formed so that the light field ( 7 ) at most partially overlapping spots of light ( 17 . 17 ' ) having.
DE10034594A 2000-07-14 2000-07-14 Dental treatment light Active DE10034594B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE10034594A DE10034594B4 (en) 2000-07-14 2000-07-14 Dental treatment light

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10034594A DE10034594B4 (en) 2000-07-14 2000-07-14 Dental treatment light
PCT/DE2001/002560 WO2002006723A1 (en) 2000-07-14 2001-07-13 Dental treatment lamp

Publications (2)

Publication Number Publication Date
DE10034594A1 DE10034594A1 (en) 2002-01-31
DE10034594B4 true DE10034594B4 (en) 2006-03-16

Family

ID=7649133

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (2)

Country Link
DE (1) DE10034594B4 (en)
WO (1) WO2002006723A1 (en)

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