US3315652A - Cylinder for a water-cooled internal combustion engine - Google Patents

Cylinder for a water-cooled internal combustion engine Download PDF

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Publication number
US3315652A
US3315652A US518306A US51830666A US3315652A US 3315652 A US3315652 A US 3315652A US 518306 A US518306 A US 518306A US 51830666 A US51830666 A US 51830666A US 3315652 A US3315652 A US 3315652A
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US
United States
Prior art keywords
cylinder head
portions
base plate
defining
cylinder
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.)
Expired - Lifetime
Application number
US518306A
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English (en)
Inventor
Ries Erich
Muth Rolf
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.)
Caterpillar Energy Solutions GmbH
Original Assignee
Motoren Werke Mannheim AG
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Filing date
Publication date
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Publication of US3315652A publication Critical patent/US3315652A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4285—Shape or arrangement of intake or exhaust channels in cylinder heads of both intake and exhaust channel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/02—Cylinders; Cylinder heads  having cooling means
    • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling
    • F02F1/14—Cylinders with means for directing, guiding or distributing liquid stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/02—Cylinders; Cylinder heads  having cooling means
    • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling
    • F02F1/16—Cylinder liners of wet type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/26—Cylinder heads having cooling means
    • F02F1/36—Cylinder heads having cooling means for liquid cooling
    • F02F1/40—Cylinder heads having cooling means for liquid cooling cylinder heads with means for directing, guiding, or distributing liquid stream 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/14—Direct injection into combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • This invention relates to a cylinder for a water-cooled internal combustion engine, more especially a diesel engine having separate cylinder heads.
  • An object of the invention is to conduct the cooling water in such a way to those parts of the cylinder which require cooling that local overheating and supercooling and also vapour locks are avoided, and the cylinder is thus better able to withstand high thermal stresses without damage, more especially without cracking the cylinder head or carbonising the injection nozzle.
  • a cylinder for a Water-cooled internal combustion engine comprising a cylinder body, portions of said body defining a substantially cylindrical working space therein, a hollow cylinder head at an upper end of said cylinder body, a base plate of said cylinder head bounding an upper end of said working space, portions of said cylinder body defining a cooling jacket chamber extending around said working space and to the region of said base plate for cooling said cylinder body with cooling water, portions of said base plate defining first and second transfer opening disposed to one side of the working space axis and extending through said base plate and in communication with said chamber for leading through said base plate cooling water from said chamber, other portions of said base plate defining an outlet valve port and an inlet valve port extending through said base plate and disposed to respective opposite sides of said axis, a tubular gas inlet duct and a tubular gas outlet duct of said cylinder head extending to the inlet valve port and the outlet valve port respectively and having their interiors in communication with the respective ports, portions of
  • the receiving chambers are almost completely covered from above, it is primarily to the hot base plate of the cylinder head that the cooling water is supplied. However, because the receiving chambers are not completely covered, vapour bubbles are able to ascend and escape.
  • the gas outlet duct preferably extends through a location directly above the second receiving chamber. In this way, a very effective cooling of the duct is achieved.
  • the first receiving chamber is preferably covered by a transverse partition wall which extends in a plane perpendicular to the working space axis from radially outer boundary walls of the receiving chamber to the middle of the cylinder head, and which encircles the housing.
  • a uniform distribution of cooling water in the cooling jacket chamber is advantageously obtained by at least a third lateral transfer opening being disposed in the cylinder head base plate at the same side of the working space axis as the outlet opening, the cross-sectional area of the third opening being less than the total cross-sectional area of the first and second openings.
  • the cooling water flows into the cooling jacket cham'ber from an inlet opening situated beneath the first and second transfer openings and at the lowest point of the chamber.
  • the desired uniform flow of cooling water is obtained, despite the shorter travel from the inlet opening to the first transfer opening, by the fact that the first and second transfer openings lead to longer and more resistant flow paths in the cylinder head than does the third transfer opening.
  • the escape of vapour bubbles upwardly from the first receiving chamber is advantageously achieved by providing a clearance between the transverse partition wall and the nozzle or plug housing. This can also be achieved by forming the transverse partition wall with a vapourventing aperture, which is situated above the first transfer opening and of which the cross-sectional area is smaller than that of the first transfer opening.
  • the discharge of vapour bubbles from the second receiving chamber is advantageously effected by a free gap being situated between a major part of the gas outlet duct and an adjacent outer wall of the cylinder head.
  • FIGURE 1 is a vertical section taken on the line II in FIGURE 2 through a cylinder of a water-cooled diesel engine having separate cylinder heads, the section plane containing the axis of a cylindrical working space of the cylinder, and
  • FIGURE 2 shows a section taken on the line II-II of FIGURE 1.
  • the cylinder consists of a cylinder body and a cylinder head disposed at an upper end of the cylinder body.
  • the cylinder head comprises a base plate 1, a top plate 2, side Walls 3, 4, 5 and 6, a tubular gas inlet duct 7 and a tubular gas outlet duct 8.
  • the base plate 1 closes the upper end of a cylindrical working space in the cylinder body.
  • the gas ducts 7 and 8 communicate respectively with a valve inlet port and a valve outlet port disposed to respective opposite sides of the working space axis 9.
  • an injection nozzle housing 10 which can accommodate a direct injection nozzle (not shown).
  • the housing 111 would accommodate a sparking plug.
  • a first transfer opening 11 and a second transfer opening 12 in the base plate 1 of the cylinder head Situated near the Wall 4 are a first transfer opening 11 and a second transfer opening 12 in the base plate 1 of the cylinder head.
  • the openings 11 and 12 open into a first receiving chamber 15 and a second receiving chamber 16, respectively.
  • the chambers 15 and 16 are separated one from the other by a partition wall 17, which extends from the base plate 1 up to the outlet duct 8.
  • Each chamber 15 and 16 covers about a quarter of the area of the upper major surface of the base plate 1.
  • the first receiving chamber 15 is covered from above by a transverse partition wall 18, which encircles the nozzle housing with clearance and which extends, up to the axis 9 in a plane perpendicular to the axis 9, between the walls 3 and 4 and the outlet duct 8.
  • the walls 3 and 4 form the radially outer limits of the chamber 15.
  • Formed in the transverse partition wall 18 is a vapour-venting aperture 19, which is above the opening 11.
  • the cross-sectional area of the aperture 19 is less than that of the opening 11, advantageously in the ratio 1:10.
  • the second receiving chamber 16 is so covered from above by the outlet duct 8 that there is a free gap 2@ between a major part of the outlet duct 8 and the adjacent outer wall 5.
  • a cooling jacket chamber 22 is defined by a sleeve 23 of the cylinder body and a cooling jacket 24 of the cylinder body and has an approximately annular section in planes perpendicular to the axis 9. It does not communicate with the cooling jacket chambers of the adjacent cylinders, but is merely provided with fresh cooling water through an inlet opening 25 from a distributing duct 26.
  • the distributing duct 26 extends along the cylinder block and supplies the other cylinders in the same way.
  • the cooling water discharges from the opening 25, which is beneath the openings 11 and 12, into the chamber 22, where it forks to give a stream 27 flowing directly to the openings 11 and 12, and a stream 2? flowing around the sleeve 23 to the opening 13 and thence as a stream 29 to the outlet opening 1
  • the stream 27 flowing to the opening 11 branches in the chamber into streams 3t! and 31, which cool the corresponding part of the base plate 1, the nozzle housing 11 the web portion 21 and the adjoining wall of the outlet duct 8 and then flow via the outside of the inlet duct 7 to the outlet opening 14.
  • Two further streams 32 and 33 are branched off from the streams 311 and 31, the first through the aperture 19 and the second through the clearance between the transverse partition wall 18 and the nozzle housing 10, and they remove from the chamber 15 vapour bubbles which would interfere with the cooling action.
  • a stream 34 branched from the stream 27 and passing through the opening 12 cools the base plate 1 and the outlet duct 8 in the region of the second receivchamber 16 and then flows via the outside of the inlet duct 7 to the outlet opening 14. In this Way, any vapour bubbles are able to escape upwardly through the gap 20.
  • the inlet duct which does not require cooling but rather belongs to those parts of the cylinder head which are heated, is swept over near its upper end by the heated cooling water, while heat is supplied to its lower end from the hot base plate 1.
  • all components of the cylinder head assume a fairly even temperature, this preventing heat cracks from being caused.
  • the streams 30, 31 and 3-4 meet greater flow resistance than does the stream 29, it is possible to produce a uniform cooling flow around the cylinder sleeve 23 in the form of the streams 27 and 28.
  • a too strong emphasising of the stream 28 is prevented by the total cross-sectional area of the openings 11 and 12 being greater than that of the opening 13. In this respect, a ratio of 8:1 has proved expedient.
  • a cylinder for a water-cooled internal combustion engine comprising a cylinder body, portions of said body defining a substantially cylindrical working space therein, a hollow cylinder head at an upper end of said cylinder body, a base plate of said cylinder head bounding an upper end of said working space, portions of said cylinder body defining a cooling jacket chamber extending around said working space and to the region of said base plate for cooling said cylinder body with cooling water, portions of said base plate defining first and second transfer openings disposed to one side of the working space axis and extending through said base plate and in communication with said chamber for leading through said base plate cooling water from said chamber, other portions of said base plate defining an outlet valve port and an inlet valve port extending through said base plate and disposed to respective opposite sides of said axis, a tubular gas inlet duct and a tubular gas outlet duct of said cylinder head extending to the inlet valve port and the outlet valve port respectively and having their interiors in communication with the respective ports, portions of said inlet duct and said outlet
  • a cylinder as claimed in claim 2 and further comprising an outer wall of said cylinder head adjacent to said outlet duct, and portions of said outer wall and of a major part of said outlet duct defining a gap therebetween forming part of said second conduit means.
  • a cylinder as claimed in claim 4 and further comprising portions of said housing and of said partition wall defining a clearance therebetween.
  • a cylinder as claimed in claim 4 and further comprising portions of said partition Wall defining a vapourventing aperture disposed above said first transfer opening and of a cross-sectional area smaller than that of said first transfer opening.
  • a cylinder as claimed in claim 1 and further comprising further portions of said base plate defining a third transfer opening to the side of said axis opposite to said one side, said third transfer opening extending through said base plate and communicating with said cooling jacket chamber and being of a cross-sectional area less than the total cross-sectional area of said first and second transfer openings, and portions of said cylinder body defining a cooling water inlet opening into said cooling jacket chamber at a location beneath said first and second transfer openings and remote from said cylinder head.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
US518306A 1965-01-05 1966-01-03 Cylinder for a water-cooled internal combustion engine Expired - Lifetime US3315652A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM0063698 1965-01-05

Publications (1)

Publication Number Publication Date
US3315652A true US3315652A (en) 1967-04-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
US518306A Expired - Lifetime US3315652A (en) 1965-01-05 1966-01-03 Cylinder for a water-cooled internal combustion engine

Country Status (10)

Country Link
US (1) US3315652A (is)
AT (1) AT264926B (is)
BE (1) BE673846A (is)
CH (1) CH432127A (is)
DE (1) DE1476397A1 (is)
DK (1) DK112417B (is)
FR (1) FR1460337A (is)
GB (1) GB1083951A (is)
NL (1) NL149257B (is)
SE (1) SE310961B (is)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3405696A (en) * 1966-06-01 1968-10-15 Gen Motors Corp Individual cylinder head for internal combustion engine
US3420215A (en) * 1965-12-10 1969-01-07 Maybach Mercedes Benz Motorenb Liquid-cooled cylinder head for internal combustion engines
US3590789A (en) * 1969-02-08 1971-07-06 Maschf Augsburg Nuernberg Ag Cylinder head for a fuel injection internal combustion engine
US3769948A (en) * 1971-08-03 1973-11-06 List H Cylinder head for a water-cooled internal combustion engine
US3818878A (en) * 1973-04-23 1974-06-25 Gen Motors Corp Improved cylinder head cooling
US4121550A (en) * 1974-08-07 1978-10-24 Motoren-Und Turbinen-Union Friedrichshafen Gmbh Liquid-cooled cylinder head
US4625682A (en) * 1983-11-09 1986-12-02 Motoren-Werke Mannheim Aktiengesellschaft vorm. Renz Abt. stationarer Motorenbau Cylinder head
US4656975A (en) * 1985-04-22 1987-04-14 Johnson Kenneth A Engine cooling system
US4714058A (en) * 1984-12-10 1987-12-22 Mazda Motor Corporation Spark-ignited internal combustion engine
EP0450067A1 (en) * 1989-08-30 1991-10-09 Kabushiki Kaisha Komatsu Seisakusho Cylinder liner cooling system
US5195468A (en) * 1992-09-29 1993-03-23 Clark Richard J Cylinder head cooling system
US5860394A (en) * 1996-03-27 1999-01-19 Toyota Jidosha Kabushiki Kaisha Method for suppressing formation of deposits on fuel injector and device for injecting fuel
US20050229875A1 (en) * 2002-10-25 2005-10-20 Fev Motorentechnik Gmbh Cylinder head for a water-cooled internal combustion piston engine having inner reinforcement
US20160298522A1 (en) * 2013-12-20 2016-10-13 Scania Cv Ab Cooler arrangement for cooling at least one cylinder of a combustion engine
US20170051713A1 (en) * 2015-08-21 2017-02-23 Cummins Inc. Nozzle combustion shield and sealing member with improved heat transfer capabilities

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57157412A (en) * 1981-03-24 1982-09-29 Tokyo Shibaura Electric Co Interlock condition discriminator
JPH07103828B2 (ja) * 1987-11-17 1995-11-08 本田技研工業株式会社 水冷式多気筒エンジンのシリンダヘッド
JP2575807B2 (ja) * 1988-05-30 1997-01-29 ヤマハ発動機株式会社 ４サイクルエンジンのシリンダヘッド冷却構造
ES2044378T3 (es) * 1989-11-29 1994-01-01 Yamaha Motor Co Ltd Sistema de refrigeracion para un motor multivalvulas.
DE10007151A1 (de) 2000-02-17 2001-08-23 Bayerische Motoren Werke Ag Flüssigkeitsgekühlter Querstrom-Zylinderkopf für Brennkraftmaschinen mit in Reihe angeordneten Zylindern
AT501008B1 (de) * 2006-02-02 2007-12-15 Avl List Gmbh Flüssigkeitsgekühlte brennkraftmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1845521A (en) * 1929-01-02 1932-02-16 Carl A Ross Cooling system for engine cylinders
US2000979A (en) * 1932-07-12 1935-05-14 Ingersoll Rand Co Water jacket construction for engines
US2493532A (en) * 1944-11-13 1950-01-03 Fodens Ltd Cooling arrangement of compression ignition internal-combustion engines
US2619078A (en) * 1947-06-30 1952-11-25 Julius E Witzky Cylinder head assembly for internal-combustion engines
US2785664A (en) * 1954-06-01 1957-03-19 Ricardo & Co Engineers Detachable cylinder head constructions for liquid cooled fuel injection compression ignition engines
US2788776A (en) * 1953-11-26 1957-04-16 Ricardo & Co Engineers Detachable cylinder head constructions for liquid-cooled internal combustion engines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1845521A (en) * 1929-01-02 1932-02-16 Carl A Ross Cooling system for engine cylinders
US2000979A (en) * 1932-07-12 1935-05-14 Ingersoll Rand Co Water jacket construction for engines
US2493532A (en) * 1944-11-13 1950-01-03 Fodens Ltd Cooling arrangement of compression ignition internal-combustion engines
US2619078A (en) * 1947-06-30 1952-11-25 Julius E Witzky Cylinder head assembly for internal-combustion engines
US2788776A (en) * 1953-11-26 1957-04-16 Ricardo & Co Engineers Detachable cylinder head constructions for liquid-cooled internal combustion engines
US2785664A (en) * 1954-06-01 1957-03-19 Ricardo & Co Engineers Detachable cylinder head constructions for liquid cooled fuel injection compression ignition engines

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3420215A (en) * 1965-12-10 1969-01-07 Maybach Mercedes Benz Motorenb Liquid-cooled cylinder head for internal combustion engines
US3405696A (en) * 1966-06-01 1968-10-15 Gen Motors Corp Individual cylinder head for internal combustion engine
US3590789A (en) * 1969-02-08 1971-07-06 Maschf Augsburg Nuernberg Ag Cylinder head for a fuel injection internal combustion engine
US3769948A (en) * 1971-08-03 1973-11-06 List H Cylinder head for a water-cooled internal combustion engine
US3818878A (en) * 1973-04-23 1974-06-25 Gen Motors Corp Improved cylinder head cooling
US4121550A (en) * 1974-08-07 1978-10-24 Motoren-Und Turbinen-Union Friedrichshafen Gmbh Liquid-cooled cylinder head
US4625682A (en) * 1983-11-09 1986-12-02 Motoren-Werke Mannheim Aktiengesellschaft vorm. Renz Abt. stationarer Motorenbau Cylinder head
US4714058A (en) * 1984-12-10 1987-12-22 Mazda Motor Corporation Spark-ignited internal combustion engine
US4656975A (en) * 1985-04-22 1987-04-14 Johnson Kenneth A Engine cooling system
EP0450067A4 (en) * 1989-08-30 1991-12-18 Kabushiki Kaisha Komatsu Seisakusho Cooling method of cylinder liner of engine
EP0450067A1 (en) * 1989-08-30 1991-10-09 Kabushiki Kaisha Komatsu Seisakusho Cylinder liner cooling system
US5115771A (en) * 1989-08-30 1992-05-26 Kabushiki Kaisha Komatsu Seisakusho Method of cooling cylinder liners in an engine
US5195468A (en) * 1992-09-29 1993-03-23 Clark Richard J Cylinder head cooling system
US5860394A (en) * 1996-03-27 1999-01-19 Toyota Jidosha Kabushiki Kaisha Method for suppressing formation of deposits on fuel injector and device for injecting fuel
US20050229875A1 (en) * 2002-10-25 2005-10-20 Fev Motorentechnik Gmbh Cylinder head for a water-cooled internal combustion piston engine having inner reinforcement
US7100545B2 (en) * 2002-10-25 2006-09-05 Fev Motorentechnik Gmbh Cylinder head for a water-cooled internal combustion piston engine having inner reinforcement
US20160298522A1 (en) * 2013-12-20 2016-10-13 Scania Cv Ab Cooler arrangement for cooling at least one cylinder of a combustion engine
US10634037B2 (en) * 2013-12-20 2020-04-28 Scania Cv Ab Cooler arrangement for cooling at least one cylinder of a combustion engine
US20170051713A1 (en) * 2015-08-21 2017-02-23 Cummins Inc. Nozzle combustion shield and sealing member with improved heat transfer capabilities
US10605213B2 (en) * 2015-08-21 2020-03-31 Cummins Inc. Nozzle combustion shield and sealing member with improved heat transfer capabilities

Also Published As

Publication number Publication date
DK112417B (da) 1968-12-09
NL149257B (nl) 1976-04-15
NL6514953A (is) 1966-07-06
FR1460337A (fr) 1966-11-25
AT264926B (de) 1968-09-25
SE310961B (is) 1969-05-19
GB1083951A (en) 1967-09-20
BE673846A (is) 1966-04-15
DE1476397A1 (de) 1969-05-29
CH432127A (de) 1967-03-15

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