FR2138904B1 - - Google Patents

Info

Publication number
FR2138904B1
FR2138904B1 FR7218312A FR7218312A FR2138904B1 FR 2138904 B1 FR2138904 B1 FR 2138904B1 FR 7218312 A FR7218312 A FR 7218312A FR 7218312 A FR7218312 A FR 7218312A FR 2138904 B1 FR2138904 B1 FR 2138904B1
Authority
FR
France
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
FR7218312A
Other versions
FR2138904A1 (fr
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of FR2138904A1 publication Critical patent/FR2138904A1/fr
Application granted granted Critical
Publication of FR2138904B1 publication Critical patent/FR2138904B1/fr
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/02Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
    • H01L27/04Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body
    • H01L27/06Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including a plurality of individual components in a non-repetitive configuration
    • H01L27/0611Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including a plurality of individual components in a non-repetitive configuration integrated circuits having a two-dimensional layout of components without a common active region
    • H01L27/0617Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including a plurality of individual components in a non-repetitive configuration integrated circuits having a two-dimensional layout of components without a common active region comprising components of the field-effect type
    • H01L27/0635Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including a plurality of individual components in a non-repetitive configuration integrated circuits having a two-dimensional layout of components without a common active region comprising components of the field-effect type in combination with bipolar transistors and diodes, or resistors, or capacitors
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
    • H01L21/18Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
    • H01L21/30Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/31Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
    • H01L21/32Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers using masks
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/74Making of localized buried regions, e.g. buried collector layers, internal connections substrate contacts
    • H01L21/743Making of internal connections, substrate contacts
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/76Making of isolation regions between components
    • H01L21/762Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
    • H01L21/76202Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using a local oxidation of silicon, e.g. LOCOS, SWAMI, SILO
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/76Making of isolation regions between components
    • H01L21/762Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
    • H01L21/76202Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using a local oxidation of silicon, e.g. LOCOS, SWAMI, SILO
    • H01L21/76205Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using a local oxidation of silicon, e.g. LOCOS, SWAMI, SILO in a region being recessed from the surface, e.g. in a recess, groove, tub or trench region
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/76Making of isolation regions between components
    • H01L21/762Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
    • H01L21/76224Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using trench refilling with dielectric materials
    • H01L21/76229Concurrent filling of a plurality of trenches having a different trench shape or dimension, e.g. rectangular and V-shaped trenches, wide and narrow trenches, shallow and deep trenches
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/76Making of isolation regions between components
    • H01L21/762Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
    • H01L21/76224Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using trench refilling with dielectric materials
    • H01L21/76232Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using trench refilling with dielectric materials of trenches having a shape other than rectangular or V-shape, e.g. rounded corners, oblique or rounded trench walls
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/76Making of isolation regions between components
    • H01L21/762Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
    • H01L21/76224Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using trench refilling with dielectric materials
    • H01L21/76237Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using trench refilling with dielectric materials introducing impurities in trench side or bottom walls, e.g. for forming channel stoppers or alter isolation behavior
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/76Making of isolation regions between components
    • H01L21/763Polycrystalline semiconductor regions
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/77Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
    • H01L21/78Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
    • H01L21/82Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
    • H01L21/822Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
    • H01L21/8222Bipolar technology
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00Details of semiconductor or other solid state devices
    • H01L23/52Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
    • H01L23/535Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including internal interconnections, e.g. cross-under constructions
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001Technical content checked by a classifier
    • H01L2924/0002Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
FR7218312A 1971-05-22 1972-05-23 Expired FR2138904B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7107039.A NL166156C (nl) 1971-05-22 1971-05-22 Halfgeleiderinrichting bevattende ten minste een op een halfgeleidersubstraatlichaam aangebrachte halfge- leiderlaag met ten minste een isolatiezone, welke een in de halfgeleiderlaag verzonken isolatielaag uit door plaatselijke thermische oxydatie van het half- geleidermateriaal van de halfgeleiderlaag gevormd isolerend materiaal bevat en een werkwijze voor het vervaardigen daarvan.

Publications (2)

Publication Number Publication Date
FR2138904A1 FR2138904A1 (fr) 1973-01-05
FR2138904B1 true FR2138904B1 (fr) 1980-04-04

Family

ID=19813232

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7218312A Expired FR2138904B1 (fr) 1971-05-22 1972-05-23

Country Status (16)

Country Link
US (1) US4272776A (fr)
JP (3) JPS5236394B1 (fr)
AR (1) AR193866A1 (fr)
AT (1) AT341000B (fr)
AU (1) AU473149B2 (fr)
BE (1) BE783737A (fr)
BR (1) BR7203232D0 (fr)
CA (1) CA975467A (fr)
CH (1) CH555088A (fr)
DE (1) DE2224634C2 (fr)
ES (2) ES403027A1 (fr)
FR (1) FR2138904B1 (fr)
GB (1) GB1393123A (fr)
IT (1) IT955675B (fr)
NL (1) NL166156C (fr)
SE (1) SE382281B (fr)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4396933A (en) * 1971-06-18 1983-08-02 International Business Machines Corporation Dielectrically isolated semiconductor devices
US3955269A (en) * 1975-06-19 1976-05-11 International Business Machines Corporation Fabricating high performance integrated bipolar and complementary field effect transistors
US3961999A (en) * 1975-06-30 1976-06-08 Ibm Corporation Method for forming recessed dielectric isolation with a minimized "bird's beak" problem
FR2408914A1 (fr) * 1977-11-14 1979-06-08 Radiotechnique Compelec Dispositif semi-conducteur monolithique comprenant deux transistors complementaires et son procede de fabrication
JPS54142688A (en) * 1978-04-28 1979-11-07 Shimada Burasuto Kougiyou Kk Inner surface machining method and device of pipe
US4238278A (en) * 1979-06-14 1980-12-09 International Business Machines Corporation Polycrystalline silicon oxidation method for making shallow and deep isolation trenches
US4353086A (en) * 1980-05-07 1982-10-05 Bell Telephone Laboratories, Incorporated Silicon integrated circuits
USRE32090E (en) * 1980-05-07 1986-03-04 At&T Bell Laboratories Silicon integrated circuits
US4467312A (en) * 1980-12-23 1984-08-21 Tokyo Shibaura Denki Kabushiki Kaisha Semiconductor resistor device
GB2104722B (en) * 1981-06-25 1985-04-24 Suwa Seikosha Kk Mos semiconductor device and method of manufacturing the same
NL8203323A (nl) * 1982-08-25 1984-03-16 Philips Nv Geintegreerde weerstand.
US4637125A (en) * 1983-09-22 1987-01-20 Kabushiki Kaisha Toshiba Method for making a semiconductor integrated device including bipolar transistor and CMOS transistor
US4583282A (en) * 1984-09-14 1986-04-22 Motorola, Inc. Process for self-aligned buried layer, field guard, and isolation
US4574469A (en) * 1984-09-14 1986-03-11 Motorola, Inc. Process for self-aligned buried layer, channel-stop, and isolation
JPH0779133B2 (ja) * 1986-06-12 1995-08-23 松下電器産業株式会社 半導体装置の製造方法
US5023690A (en) * 1986-10-24 1991-06-11 Texas Instruments Incorporated Merged bipolar and complementary metal oxide semiconductor transistor device
US4737468A (en) * 1987-04-13 1988-04-12 Motorola Inc. Process for developing implanted buried layer and/or key locators
US4951115A (en) * 1989-03-06 1990-08-21 International Business Machines Corp. Complementary transistor structure and method for manufacture
US5139966A (en) * 1990-04-02 1992-08-18 National Semiconductor Corporation Low resistance silicided substrate contact
JPH04112565A (ja) * 1990-08-31 1992-04-14 Nec Corp 半導体抵抗素子及びその製造方法
US5504363A (en) * 1992-09-02 1996-04-02 Motorola Inc. Semiconductor device
DE602006004834D1 (de) * 2005-12-22 2009-03-05 Freiberger Compound Mat Gmbh Verfahren zum selektiven Maskieren von III-N-Schichten und zur Herstellung von selbsttragenden III-N-Schichten oder Bauelementen
US7691734B2 (en) * 2007-03-01 2010-04-06 International Business Machines Corporation Deep trench based far subcollector reachthrough
DE102007029756A1 (de) * 2007-06-27 2009-01-02 X-Fab Semiconductor Foundries Ag Halbleiterstruktur zur Herstellung eines Trägerwaferkontaktes in grabenisolierten SOI-Scheiben
US9176173B2 (en) * 2011-11-28 2015-11-03 Texas Instruments Incorporated Method for detecting imperfect mounting of a rod-shaped metallic object in a metallic hollow shaft and a device
KR101874586B1 (ko) * 2012-08-06 2018-07-04 삼성전자주식회사 포토키를 이용한 반도체 소자의 제조 방법
US20190305128A1 (en) * 2018-04-03 2019-10-03 Vanguard International Semiconductor Corporation Semiconductor structure and method for forming the same

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Publication number Priority date Publication date Assignee Title
US3461003A (en) * 1964-12-14 1969-08-12 Motorola Inc Method of fabricating a semiconductor structure with an electrically isolated region of semiconductor material
US3372063A (en) * 1964-12-22 1968-03-05 Hitachi Ltd Method for manufacturing at least one electrically isolated region of a semiconductive material
US3598664A (en) * 1964-12-29 1971-08-10 Texas Instruments Inc High frequency transistor and process for fabricating same
US3386865A (en) * 1965-05-10 1968-06-04 Ibm Process of making planar semiconductor devices isolated by encapsulating oxide filled channels
US3534234A (en) * 1966-12-15 1970-10-13 Texas Instruments Inc Modified planar process for making semiconductor devices having ultrafine mesa type geometry
FR1527898A (fr) * 1967-03-16 1968-06-07 Radiotechnique Coprim Rtc Agencement de dispositifs semi-conducteurs portés par un support commun et son procédé de fabrication
US3432792A (en) * 1967-08-03 1969-03-11 Teledyne Inc Isolated resistor for integrated circuit
GB1206308A (en) * 1967-11-22 1970-09-23 Sony Corp Method of making semiconductor wafer
US3617822A (en) * 1967-12-05 1971-11-02 Sony Corp Semiconductor integrated circuit
FR1601776A (fr) * 1967-12-05 1970-09-14 Sony Corp Procédé de fabrication de circuits semi-conducteurs intégrés et circuits ainsi obtenus
US3649386A (en) * 1968-04-23 1972-03-14 Bell Telephone Labor Inc Method of fabricating semiconductor devices
US3648128A (en) * 1968-05-25 1972-03-07 Sony Corp An integrated complementary transistor circuit chip with polycrystalline contact to buried collector regions
US3702790A (en) * 1968-12-02 1972-11-14 Nippon Electric Co Monolithic integrated circuit device and method of manufacturing the same
US3659162A (en) * 1968-12-27 1972-04-25 Nippon Electric Co Semiconductor integrated circuit device having improved wiring layer structure
US3621346A (en) * 1970-01-28 1971-11-16 Ibm Process for forming semiconductor devices with polycrystalline diffusion pathways and devices formed thereby
US3703420A (en) * 1970-03-03 1972-11-21 Ibm Lateral transistor structure and process for forming the same
US3657612A (en) * 1970-04-20 1972-04-18 Ibm Inverse transistor with high current gain
US3865624A (en) * 1970-06-29 1975-02-11 Bell Telephone Labor Inc Interconnection of electrical devices
NL169936C (nl) * 1970-07-10 1982-09-01 Philips Nv Halfgeleiderinrichting omvattende een halfgeleiderlichaam met een althans ten dele in het halfgeleiderlichaam verzonken oxydepatroon.
US3736193A (en) * 1970-10-26 1973-05-29 Fairchild Camera Instr Co Single crystal-polycrystalline process for electrical isolation in integrated circuits
US3648125A (en) * 1971-02-02 1972-03-07 Fairchild Camera Instr Co Method of fabricating integrated circuits with oxidized isolation and the resulting structure
US3796613A (en) * 1971-06-18 1974-03-12 Ibm Method of forming dielectric isolation for high density pedestal semiconductor devices
GB1516304A (en) * 1974-07-25 1978-07-05 Dunlop Ltd Outflow meter

Also Published As

Publication number Publication date
AT341000B (de) 1978-01-10
FR2138904A1 (fr) 1973-01-05
CH555088A (de) 1974-10-15
GB1393123A (en) 1975-05-07
DE2224634A1 (de) 1972-11-30
US4272776A (en) 1981-06-09
SE382281B (sv) 1976-01-19
ATA439472A (de) 1977-05-15
AU4241472A (en) 1973-11-22
JPS5236394B1 (fr) 1977-09-14
CA975467A (en) 1975-09-30
BR7203232D0 (pt) 1973-08-09
JPS52144985A (en) 1977-12-02
NL166156C (nl) 1981-06-15
AU473149B2 (en) 1976-06-17
JPS52144984A (en) 1977-12-02
DE2224634C2 (de) 1982-04-22
BE783737A (fr) 1972-11-20
ES403027A1 (es) 1975-04-16
NL7107039A (fr) 1972-11-24
IT955675B (it) 1973-09-29
ES417610A1 (es) 1976-06-16
AR193866A1 (es) 1973-05-31
NL166156B (nl) 1981-01-15

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