DE19730040A1 - Electrostatic air filter for removal of microorganisms - Google Patents

Electrostatic air filter for removal of microorganisms

Info

Publication number
DE19730040A1
DE19730040A1 DE19730040A DE19730040A DE19730040A1 DE 19730040 A1 DE19730040 A1 DE 19730040A1 DE 19730040 A DE19730040 A DE 19730040A DE 19730040 A DE19730040 A DE 19730040A DE 19730040 A1 DE19730040 A1 DE 19730040A1
Authority
DE
Germany
Prior art keywords
layers
layer
microorganisms
denatured
denaturing
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Withdrawn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
DE19730040A
Other languages
German (de)
Inventor
Heinz Prof Dr Hoelter
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19730040A priority Critical patent/DE19730040A1/en
Priority to ES98936146T priority patent/ES2239397T3/en
Priority to BR9811268-6A priority patent/BR9811268A/en
Priority to CA002286856A priority patent/CA2286856A1/en
Priority to PCT/DE1998/001599 priority patent/WO1998056489A1/en
Priority to DE59812617T priority patent/DE59812617D1/en
Priority to AU85308/98A priority patent/AU739503B2/en
Priority to US09/424,969 priority patent/US6375721B1/en
Priority to PL98337280A priority patent/PL190125B1/en
Priority to CNB988060906A priority patent/CN1182909C/en
Priority to AT98936146T priority patent/ATE289857T1/en
Priority to EP98936146A priority patent/EP0989901B1/en
Priority to JP50132899A priority patent/JP2002510240A/en
Priority to DK98936146T priority patent/DK0989901T3/en
Priority to PT98936146T priority patent/PT989901E/en
Publication of DE19730040A1 publication Critical patent/DE19730040A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
    • B03C3/013—Conditioning by chemical additives, e.g. with SO3
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
    • B01D53/323—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00 by electrostatic effects or by high-voltage electric fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/14—Plant or installations having external electricity supply dry type characterised by the additional use of mechanical effects, e.g. gravity
    • B03C3/155—Filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/41—Ionising-electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/45—Collecting-electrodes
    • B03C3/53—Liquid, or liquid-film, electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/60—Use of special materials other than liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/88—Cleaning-out collected particles

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Electrostatic Separation (AREA)
  • Filtering Materials (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Laminated Bodies (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Treating Waste Gases (AREA)

Abstract

The filter is used for the purification of environmental air, and particles are collected on denatured layer. A denatured layer is defined as one that not only contains no nutrients for microorganisms, but is treated with additives to destroy them. The denatured layers are applied to the collector electrode, here the inside of a tube along whose axis the discharge electrode, as wire with virtually radial spikes, is charged > 7000 kV. A tube is chosen as the simplest shape for integration in an air duct. Three layers, strongly acidic, strongly alkaline, placed on either side of a neutral layer, form collector. The layers are made electrically conducting by the addition of graphite or activated charcoal. Also, layers are impregnated with monoclonal antibodies or substances to counteract endotoxin or to kill fungi. Layer is best composed of individual cells, like a chessboard, with different properties in adjacent cells, so good kill rate is achieved as microorganisms pass across, and through, layers. To keep layers moist, material is impregnated with hygroscopic substance and fine aerosol is dispersed into airstream during operation. Collectors are run in series.

Description

Der denaturierende Teil des Elektrofilters, d. h. die sog. Niederschlagselektrode hat entsprechend der Hauptanmeldung eine denaturierende Eigenschaft. Diese wird erfindungsgemäß dadurch gewährleistet, daß Tränkungen, die im Material der Niederschlagselektrode vorhanden sind einen hohen und/oder niedrigen pH-Wert, z. B. pH- Wert 1 bis 14 garantieren. Hierdurch wird die denaturierende Wirkung auf die abgeschiedenen Stoffe gewährleistet und es können z. B. keine Endotoxine entstehen.The denaturing part of the electrostatic filter, i.e. H. has the so-called precipitation electrode a denaturing property according to the main application. This will according to the invention thereby ensures that impregnations in the material of the Precipitation electrodes are present with a high and / or low pH, e.g. B. pH Guarantee value 1 to 14. As a result, the denaturing effect on the deposited Guaranteed fabrics and it can, for. B. no endotoxins arise.

Sichergestellt werden muß jedoch, daß die denaturierenden Eigenschaften des Materials der Niederschlagselektrode unter allen wechselnden Betriebsbedingungen wie z. B. unterschiedlicher Luftfeuchtigkeit gewährleistet ist.However, it must be ensured that the denaturing properties of the material Precipitation electrode under all changing operating conditions such as B. different humidity is guaranteed.

Aus diesem Grunde wird erfindungsgemäß vorgeschlagen, die Matten auf der Niederschlagselektrode oder das Material was auf der Niederschlagselektrode ausgebildet ist mit Substanzen zu versehen, die Salze enthalten, Kali- und/oder Natriumsalze, die durch Flüssigkeitsaufnahme praktisch flüssig sind und nach dem Abtrocknen Kristallkörper bilden. Die denaturierende Schicht wird durch Luftfeuchtigkeit der vorbeistreichenden, zu reinigenden Luft, ständig aktiv gehalten indem durch die hygroskopischen Eigenschaften der Salze Feuchtigkeit aufgenommen wird und eine denaturierende Phase im pH-Wert z. B. Bereich 12 bis 14 oder im Bereich 1 bis pH-Wert 3 vorliegt. For this reason, the invention proposes that the mats on the Precipitation electrode or the material that is formed on the precipitation electrode to be provided with substances which contain salts, potassium and / or sodium salts which Liquid absorption are practically liquid and form crystal bodies after drying. The denaturing layer is cleaned by the humidity of the passing by Air, kept constantly active by the hygroscopic properties of the salts Moisture is absorbed and a denaturing phase in pH z. B. Area 12 to 14 or in the range 1 to pH 3.  

Selbstverständlich ist die Erfindung nicht auf die vorstehend im einzelnen beschriebenen und ausgeführten Ausbildungsformen beschränkt, sondern es sind zahlreiche Abänderungen möglich ohne jedoch von dem Grundgedanken abzuweichen, daß hygroskopische Substanzen in der denaturierenden Oberfläche oder im Körper der Niederschlagselektrode und/oder auch Sprühelektrodenanordnung angeordnet sind, so daß die Feuchte aus der vorbeistreichenden Luft, die gereinigt werden soll, eine stetige Aktivierung des gewünschten denaturierenden Systems garantiert.Of course, the invention is not limited to that described in detail above and executed training forms limited, but there are numerous changes possible without deviating from the basic idea that hygroscopic substances in the denaturing surface or in the body of the precipitation electrode and / or also Spray electrode arrangement are arranged so that the moisture from passing by Air to be cleaned, a constant activation of the desired denaturing Systems guaranteed.

Claims (2)

1. Elektrofilter, dadurch gekennzeichnet, daß die Niederschlagselektrode, die denaturierend ausgebildet ist, so zusammengesetzt wird in der Struktur, daß Feuchtigkeit absorbierende Eigenschaften vorzugsweise durch feinste Salzkristalle gewährleistet sind.1. electrostatic precipitator, characterized in that the precipitation electrode, which is denaturing, is so composed in the structure that moisture-absorbing properties are preferably ensured by the finest salt crystals. 2. Elektrofilter nach Anspruch 1, dadurch gekennzeichnet, daß das Verfahren zur Aufrechterhaltung der Denaturierung so aufgebaut ist, daß durch Einsprühen von Feuchte und/oder auch denaturierenden Medien eine hygroskopische Eigenschaft der Niederschlags- und/oder Sprühelektrode gegeben ist und auf den vorzugsweise Seitenflächen des Elektrofiltergehäuses, so daß hier durch Einsprühen eine stetige Erneuerung der hygroskopischen und denaturierenden Eigenschaften gewährleistet werden kann.2. Electro filter according to claim 1, characterized in that the method for Maintenance of the denaturation is so constructed that by spraying in moisture and / or denaturing media a hygroscopic property of the precipitation and / or spray electrode is given and on the preferably side surfaces of the Electro filter housing, so that here by spraying a constant renewal of hygroscopic and denaturing properties can be guaranteed.
DE19730040A 1997-06-13 1997-07-14 Electrostatic air filter for removal of microorganisms Withdrawn DE19730040A1 (en)

Priority Applications (15)

Application Number Priority Date Filing Date Title
DE19730040A DE19730040A1 (en) 1997-06-13 1997-07-14 Electrostatic air filter for removal of microorganisms
ES98936146T ES2239397T3 (en) 1997-06-13 1998-06-12 IONIZATION FILTER FOR AIR CLEANING.
BR9811268-6A BR9811268A (en) 1997-06-13 1998-06-12 Ionization filter for air purification
CA002286856A CA2286856A1 (en) 1997-06-13 1998-06-12 Ionization filter for purifying air
PCT/DE1998/001599 WO1998056489A1 (en) 1997-06-13 1998-06-12 Ionisation filter for purifying air
DE59812617T DE59812617D1 (en) 1997-06-13 1998-06-12 IONIZATION FILTER FOR CLEANING AIR
AU85308/98A AU739503B2 (en) 1997-06-13 1998-06-12 Ionisation filter for purifying air
US09/424,969 US6375721B1 (en) 1997-06-13 1998-06-12 Ionization filter for purifying air
PL98337280A PL190125B1 (en) 1997-06-13 1998-06-12 Ionisation-type filter for purification of air
CNB988060906A CN1182909C (en) 1997-06-13 1998-06-12 Ionisation filter for purifying air
AT98936146T ATE289857T1 (en) 1997-06-13 1998-06-12 IONIZATION FILTER FOR PURIFYING AIR
EP98936146A EP0989901B1 (en) 1997-06-13 1998-06-12 Ionisation filter for purifying air
JP50132899A JP2002510240A (en) 1997-06-13 1998-06-12 Ionizing filter for cleaning air
DK98936146T DK0989901T3 (en) 1997-06-13 1998-06-12 Ionization filter for air purification
PT98936146T PT989901E (en) 1997-06-13 1998-06-12 IONIZATION FILTER FOR AIR PURIFICATION

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19725030A DE19725030C2 (en) 1997-06-13 1997-06-13 Ionization filter with denaturing precipitation electrode
DE19730040A DE19730040A1 (en) 1997-06-13 1997-07-14 Electrostatic air filter for removal of microorganisms

Publications (1)

Publication Number Publication Date
DE19730040A1 true DE19730040A1 (en) 1999-03-04

Family

ID=7832391

Family Applications (13)

Application Number Title Priority Date Filing Date
DE19725030A Expired - Fee Related DE19725030C2 (en) 1997-06-13 1997-06-13 Ionization filter with denaturing precipitation electrode
DE19730040A Withdrawn DE19730040A1 (en) 1997-06-13 1997-07-14 Electrostatic air filter for removal of microorganisms
DE19732335A Withdrawn DE19732335A1 (en) 1997-06-13 1997-07-28 Electrostatic air filter for removal of microorganisms
DE19735192A Withdrawn DE19735192A1 (en) 1997-06-13 1997-08-14 Electrostatic air filter for removal of microorganisms
DE19744594A Ceased DE19744594A1 (en) 1997-06-13 1997-10-09 Improving the performance of electrofilters with denaturing deposition electrodes for air purification
DE19756999A Withdrawn DE19756999A1 (en) 1997-06-13 1997-12-20 Electrostatic air filter for removal of microorganisms
DE19809068A Expired - Fee Related DE19809068C2 (en) 1997-06-13 1998-03-04 Ionization filter with denaturing precipitation electrode
DE19810449A Ceased DE19810449A1 (en) 1997-06-13 1998-03-11 Ionization device for improving room air quality
DE19819939A Withdrawn DE19819939A1 (en) 1997-06-13 1998-05-05 Electrostatic air filter for removal of microorganisms
DE19821184A Ceased DE19821184A1 (en) 1997-06-13 1998-05-12 Electrostatic air filter for removal of microorganisms
DE19822054A Ceased DE19822054A1 (en) 1997-06-13 1998-05-16 Denaturing electrofilter unit, e.g. for treating air
DE19822055A Ceased DE19822055A1 (en) 1997-06-13 1998-05-16 Ionization filter, e.g. for denaturing microorganisms
DE19825241A Withdrawn DE19825241A1 (en) 1997-06-13 1998-06-05 Electric filter ioniser, e.g. for air cleansing systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE19725030A Expired - Fee Related DE19725030C2 (en) 1997-06-13 1997-06-13 Ionization filter with denaturing precipitation electrode

Family Applications After (11)

Application Number Title Priority Date Filing Date
DE19732335A Withdrawn DE19732335A1 (en) 1997-06-13 1997-07-28 Electrostatic air filter for removal of microorganisms
DE19735192A Withdrawn DE19735192A1 (en) 1997-06-13 1997-08-14 Electrostatic air filter for removal of microorganisms
DE19744594A Ceased DE19744594A1 (en) 1997-06-13 1997-10-09 Improving the performance of electrofilters with denaturing deposition electrodes for air purification
DE19756999A Withdrawn DE19756999A1 (en) 1997-06-13 1997-12-20 Electrostatic air filter for removal of microorganisms
DE19809068A Expired - Fee Related DE19809068C2 (en) 1997-06-13 1998-03-04 Ionization filter with denaturing precipitation electrode
DE19810449A Ceased DE19810449A1 (en) 1997-06-13 1998-03-11 Ionization device for improving room air quality
DE19819939A Withdrawn DE19819939A1 (en) 1997-06-13 1998-05-05 Electrostatic air filter for removal of microorganisms
DE19821184A Ceased DE19821184A1 (en) 1997-06-13 1998-05-12 Electrostatic air filter for removal of microorganisms
DE19822054A Ceased DE19822054A1 (en) 1997-06-13 1998-05-16 Denaturing electrofilter unit, e.g. for treating air
DE19822055A Ceased DE19822055A1 (en) 1997-06-13 1998-05-16 Ionization filter, e.g. for denaturing microorganisms
DE19825241A Withdrawn DE19825241A1 (en) 1997-06-13 1998-06-05 Electric filter ioniser, e.g. for air cleansing systems

Country Status (2)

Country Link
KR (1) KR20010012181A (en)
DE (13) DE19725030C2 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19904607C1 (en) * 1999-02-05 2000-04-06 Heinz Hoelter Electrostatic filter comprises cascade of ionizing electrodes and earthing plates
DE19904606C1 (en) * 1999-02-05 2000-07-20 Heinz Hoelter Denaturizing precipitation electrode used in air purification system, has face divided into adjacent pyramids by inclined surface grooves
DE19915221C1 (en) * 1999-04-03 2000-10-12 Heinz Hoelter Air cleaning device using ion wind conditioning wall uses spray electrodes for providing ion wind at air intake and electrodes with high pH value within vertical flow conduit for air
WO2002011857A1 (en) * 2000-08-09 2002-02-14 Hoelter Heinz Dust filter for purifying air
US7033668B2 (en) 2001-08-23 2006-04-25 Tesa Ag Electrically conductive, preferably unbacked adhesive tape with permanent full-area pressure sensitive adhesion, composed of a film of a pressure sensitive adhesive which is preferably coated onto an antiadhesive medium and has an alkaline surface
DE10346826B4 (en) * 2003-10-06 2013-09-26 Behr Gmbh & Co. Kg Filter system for motor vehicles
WO2006072235A1 (en) * 2005-01-07 2006-07-13 Efs Schermbeck Gmbh Method and device for the purification and conditioning of air
DE102008056072B4 (en) * 2008-11-05 2016-09-29 Paragon Ag Apparatus and method for charging indoors with fragrances, odors and / or flavorings
AU2020469631A1 (en) * 2020-09-23 2023-05-11 Hibocare Technologies South Africa (Pty) Ltd A panel for an air circulation system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2854716A1 (en) * 1978-12-18 1980-06-19 Philips Patentverwaltung Electrostatic appts. for agitating or treating air - has cascade of anodes and cathodes at field strength below ozone generation threshold
DE2920813A1 (en) * 1979-05-23 1980-12-04 Rolf Fichtlscherer ELECTRONIC AIR PURIFIER AND IONIZER
DE19523048C1 (en) * 1995-06-24 1996-12-05 Hoelter Heinz Removal of allergenic substances e.g. spores, pollen etc.

Also Published As

Publication number Publication date
DE19735192A1 (en) 1999-03-04
DE19821184A1 (en) 1999-11-18
DE19744594A1 (en) 1999-04-15
DE19725030A1 (en) 1998-12-17
KR20010012181A (en) 2001-02-15
DE19725030C2 (en) 2000-04-27
DE19822055A1 (en) 1999-11-18
DE19756999A1 (en) 1999-06-24
DE19809068C2 (en) 2000-08-31
DE19732335A1 (en) 1999-03-04
DE19819939A1 (en) 1999-11-11
DE19825241A1 (en) 1999-12-09
DE19810449A1 (en) 1999-09-16
DE19809068A1 (en) 1999-09-09
DE19822054A1 (en) 1999-11-18

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