US3789786A - A device for applying an elongated ribbed strip to the exterior of a rotating conduit - Google Patents

A device for applying an elongated ribbed strip to the exterior of a rotating conduit Download PDF

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Publication number
US3789786A
US3789786A US00230640A US3789786DA US3789786A US 3789786 A US3789786 A US 3789786A US 00230640 A US00230640 A US 00230640A US 3789786D A US3789786D A US 3789786DA US 3789786 A US3789786 A US 3789786A
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US
United States
Prior art keywords
tool holder
axis
strip
conduit
ribbed
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
US00230640A
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English (en)
Inventor
K Wiedenmann
P Prelisauer
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.)
Wieland Werke AG
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Wieland Werke AG
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 Wieland Werke AG filed Critical Wieland Werke AG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/22—Making finned or ribbed tubes by fixing strip or like material to tubes
    • B21C37/225—Making finned or ribbed tubes by fixing strip or like material to tubes longitudinally-ribbed tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/22—Making finned or ribbed tubes by fixing strip or like material to tubes
    • B21C37/26—Making finned or ribbed tubes by fixing strip or like material to tubes helically-ribbed tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/105—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being corrugated elements extending around the tubular elements
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49377—Tube with heat transfer means
    • Y10T29/49378—Finned tube
    • Y10T29/49382—Helically finned
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49881—Assembling or joining of separate helix [e.g., screw thread]
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53113—Heat exchanger
    • Y10T29/53122—Heat exchanger including deforming means

Definitions

  • ABSTRACT A device for the manufacture of externally ribbed heat transfer conduits and/or cores insertable into conduits to provide internally ribbed heat transfer conduit.
  • Means for converting a smooth ribbon into a corrugated ribbon are mounted on a tool holder which in turn is mounted on means pivotable around an axis perpendicular both to the elongated direction of the corrugated ribbon and to the axis of the conduit, or core as the case may be.
  • This pivoting is to enable the ribbon to be wrapped around the conduit, and/or core, in close side to side abutment of the several wraps with respect to each other.
  • the wrapping angle is adjustable from about 45 to about 135 with the 90 position being chosen corresponding to the angle required for a conduit or core approximately midway between the size extremes which a given machine is to handle.
  • a given tool holder and the tools mounted thereon are readily replaceable by lifting one tool holder off the driving gears provided therefor and replacing it with another tool holder.
  • the above mentioned devices are each only suitable for a single conduit or core diameter.
  • the core consists advantageously of a conduit with or without a plug which serves as a flow seal.
  • the core can, however, advantageously also consist of a-conduit which is grooved on the inside wall or one into which a profile is inserted.
  • conduits or cores with ribs of different height are to be manufactured, the tool holder must be, movable. 1
  • This objective has been attained according to the invention by pivoting the device about a pivot axis which is at a right angle to the center axis of the conduit and extendsthrough the longitudinal axis of the corrugated ribbon, whereby the pivot axis extends through the center axis of the conduit and defined with the longitudinal axis of the corrugated ribbon an angle of approximately to 135..
  • the angle between the pivot axis and the longitudinal axis of the corrugated ribbon is advantageously approximately 90 during the manufacture of externally ribbed heat transfer conduits, or cores, and having a di- Particularly the driving elements of theftools which consist ofa pair of mating gears can be moved with the device when it is pivoted.
  • the tool holder is substantially circular.
  • the substantially circular tool holder is rotatable about an axis which is perpendicular to the longitudinal axis of the corrugated metallic ribbon and is positioned parallel to the transverse axis or plane of the smooth metallic ribbon.
  • the rotatable, circular tool holder is advantageously supported by two reccesses of the tool holder support.
  • the two recesses of the tool holder support are advantageously constructed in the form of circular segments, the radius center points of which lie in an axis coincident with the center axis of the circular tool holder.
  • the tool holder is advantageously pivotable, about its axis at the angle which is required to assure the tangential abutment of the corrugated ribbon on the conduit and the tool holder can subsequently be fixed on the "tool holder support by tightening two clamping screws.
  • the tool holder can be exchanged advantageously with a different one after the two clamping screws have been loosened and removed by lifting off the same.
  • This invention eliminates the difficult and time consuming change of tools previously experienced when product dimensions including height of ribs, were to be changed. Further, with this invention, the tool holder also may be coordinated with the tools and accommodated to the desired rib height.
  • a separation of the drive between the tool holder and the tool holder support occurs upon removal of a tool holder by lifting off a gear and thus effecting a separation of two mating gears, wherein one gear is supported in the tool holder while the other one is supported in the tool holder support.
  • FIG. 1 is a diagrammatic view of the inventive device during operation thereof with the subsequent wrapping of the corrugated metallic ribbon.
  • FIG. 2 is a schematic view of the driving elements of the tool holder.
  • a smooth metallic ribbon 1 is unwound from a reel 35 and is delivered to the tool holder 3 of the device 7. Said smooth metallic ribbon l is then converted into a corrugated metallic ribbon l in the tool holder 3 by guiding the smooth metallic ribbon through a guide piece 11 and thence through and between the teeth of the two mating gears 12 and 13.
  • the gear 13 is driven by a shaft 14 in the direction of the arcuate arrow.
  • a brake mechanism which is positioned to follow the pair of gears l2, l3 and which can be regulated by a 3 screw 15, is used to control the corrugation length of the corrugated metallic ribbon 2 after passing through the teeth by means of a plastic deformation of the ribbon.
  • a conduit which serves as a heat-transmitting conduit is identified at 4 and same is to be provided on its outside with longitudinal ribs.
  • the conduit 4 is rotated in the direction of the arcuate arrow adjacent thereto about its longitudinal axis by any convenient means (not illustrated).
  • the conduit 4 is furthermore advantageously moved in direction of the arrow 4a.
  • solder in form of a solder ribbon 5 is first wound onto the external surface of the conduit, which solder ribbon 5 is drawn from a reel 6 and runs through a flux container 8.
  • the conduit is now helically covered by the corrugated metallic ribbon 2 with the interpositioning of the solder. ribbon 5.
  • a satisfactory wrapping with only a small lateral clearance can take place only if the corrugated metallic ribbon 2 approaches at a certain angle which depends on the external diameter of the conduit andthe ribbon width.
  • This angle is obtained by a suitable pivoting of the inventive device 7 about an axis which is identified with the numeral 9.
  • a pin 30 is secured in the device 7 with its axis coincident with the pivot axis 9 and is supported in any convenient manner, such as in a bearing 29.
  • This pivot axis is positioned at a right angle to the axis 32 of the conduit and extends through the longitudinal axis 33 of the corrugated ribbon 2, whereby the pivot axis extends through the center axis 32 of the conduit and defines with the longitudinal axis 33 of the corrugated ribbon 2 an angle 36 of approximately 45 to 135. This makes possible the abutment of the corrugated metal band 2 on the conduit 4 always on the same place as seen in longitudinal direction of the pipe.
  • the clamping-screws l6 and 17 (FIG. 2) are now tightened on the tool holder 3.
  • the driving elements of the tools which consist ofa pair of mating gears l2 and 13 are moved with the device when it is pivoted.
  • the driving elements consist in this embodiment of toothed bevel gears 18, 19, 20, 21, gears 22, 23, 24, 25, 26 and shafts 27, 28.
  • the exchange or replacement of the tool holder 3 is very simple. One only needs to loosen the clamping screws 16 and 17, to remove same and to lift the tool holder 3 off from the tool holder support 10.
  • the tool holder is inserted by setting it down onto the tool holder support and by fastening the clamping screws 16 and 17.
  • This simple process is surprisingly possible because according to the invention the only connection of the driving elements between tool holder support 10 and tool holder 3 consists of two engaging gears 24, 25. In lifting off the tool holder 3, the mating gears 24, disengage because one gear 24 is sup ported on the tool holder support 10 and one gear 25 on the tool holder 3.
  • the wrapped conduit 4 is now passed through a conventional heating coil 31 which heats same to create a solder connection between conduit 4 and corrugated metallic ribbon 2.
  • the heating coil 31 encircles the wrapped conduit at any convenient selected distance from the wrapping point.
  • Eddy currents are produced in the wrapped conduit by applying to it suitable high-frequency alternating current in any conventional manner, which eddy currents heat the conduit at the desired point to the temperature which is required to bring out the desired solder connection.
  • the heating coil 31 remains fixed relative to the wrapping device so that it remains in position although the conduit 4 advantageously moves forward in the direction of arrow 4a.
  • the device 7 does not only serve, as shown, for the manufacture of externally ribbed conduits for heat transfer, but for example also for the manufacture of externally ribbed cores which can be inserted into conduits for the production of internally ribbed conduits.
  • a device for applying an elongated ribbed strip to the exterior of a rotating core means comprising:
  • rib forming means engaging said elongated strip and forming ribs thereon, said ribs extending across the width thereof;
  • support means for supporting said rib forming means for pivotal movement about a pivot axis which intersects and is perpendicular to the longitudinal axis of said core means and for supporting said ribbed elongated strip so that said ribbed strip is wound onto said rotating core means with said ribs extending parallel to the longitudinal axis of said core means;
  • adjustment means for adjusting the both (1) a first angle between the longitudinal axis of said ribbed strip and said-longitudinal axis of said rotating core means and (2) a second angle between the longitudinal axis of said ribbed strip and said pivot axis, said second angle being maintained in-the range of 45 to 135;
  • support means includes a mounting device and pin means for supporting said mounting device for pivotal movement, the axis of said pin means defining said pivot axis.
  • said rib forming means includes a pair of meshing rotating gears rotatably secured to said mounting device, said elongated strip passing therebetween, the teeth of said gears deforming said strip to form said ribs thereon.
  • said mounting device includes a tool holder support and a tool holder, said tool holder support engaging said pin means, said tool holder having said gears rotatably secured thereto, and means for supporting said tool holder for rotational movement with respect to said tool holder support.
  • said tool holder is circular shaped and is rotatably received in said arcuate recess.
  • said tool holder includes means for releasably securing said tool holder to said tool holder support to thereby facilitate a quick removal of said tool holder and the substitution of another tool holder.
  • Device including a drive gear rotatably secured to said tool holder support and a driven gear rotatably secured to said tool holder, said driven gear being coupled to one of said pair of meshing gears, a separation of said tool holder from said tool holder support effecting a separation of said driven gear from said driving gear.
  • Device including driven means for driving said drive gear, said drive means comprising a drive shaft coaxial with said pivot'axis and gear train means connecting said drive shaft to said drive gear.
  • Device according to claim'7 including clamping means for clamping said tool holder to said tool holder support.
  • gears to achieve different screw thread inclinations are pivotable about an axis which is perpendicular to and extends through the point of intersection of the ribbon longitudinal direction with the conduit axis
  • the improvement comprises a drivable shaft having an axis extending through the pivot axis and has a first bevel gear on its upper end, which first bevel gear mates with a second bevel gear which is arranged on a shaft which extends parallel to said ribbon, 'a third bevel gear mounted on said shaft and gear train means for drivingly connecting said third bevel gear to said tools.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Automatic Assembly (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US00230640A 1971-03-04 1972-03-01 A device for applying an elongated ribbed strip to the exterior of a rotating conduit Expired - Lifetime US3789786A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712110306 DE2110306B2 (de) 1971-03-04 1971-03-04 Antrieb fuer ein metallband zufuehrende raeder an einer vor richtung zur herstellung von rippenrohren

Publications (1)

Publication Number Publication Date
US3789786A true US3789786A (en) 1974-02-05

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US00230640A Expired - Lifetime US3789786A (en) 1971-03-04 1972-03-01 A device for applying an elongated ribbed strip to the exterior of a rotating conduit

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Country Link
US (1) US3789786A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE780073A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2110306B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2128337B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1355902A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT952893B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL7202197A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SE (1) SE369381B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4203205A (en) * 1976-12-27 1980-05-20 Spirec l'Echangeur Spirale Ever Clean Method and apparatus for the manufacture of a heat exchanger
US4259771A (en) * 1978-03-24 1981-04-07 Nishiyodo Air Conditioner Co., Ltd. Apparatus for producing heat transfer tube
US4336642A (en) * 1974-12-24 1982-06-29 B.V. Machinefabriek Breda V/H Backer & Rueb Method of enlarging the heat exchange surface of a tubular element
US4352227A (en) * 1980-05-20 1982-10-05 Nishiyodo Air Conditioner Co., Ltd. Apparatus for producing a finned tube for heat transfer
US5423121A (en) * 1994-01-18 1995-06-13 Mcelroy Manufacturing, Inc. Automated fin tube process
US5679106A (en) * 1994-12-26 1997-10-21 Nippondenso Co., Ltd. Roller for forming corrugated fin
US5781987A (en) * 1994-09-16 1998-07-21 Retermia Oy Apparatus for manufacturing a needle-rib heat-exchanger construction
US6851188B2 (en) * 2001-11-02 2005-02-08 Heidelberger Druckmaschinen Ag Method for making a low inertia roll
US20170074600A1 (en) * 2014-05-16 2017-03-16 Henan New Kelong Electrical Appliances Co., Ltd Spiral louver shaped condenser with multilayer spatial structure

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112475026B (zh) * 2020-11-23 2021-07-20 佛山市豹王滤芯制造有限公司 一种滤清器中心管的连续成型装置
CN115431215B (zh) * 2022-10-10 2025-05-09 乳源瑶族自治县银源水电安装工程有限公司 一种用于输送管道的可调式对接装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1570117A (en) * 1922-12-30 1926-01-19 Schutte & Koerting Co Apparatus for applying helical ribs to pipes
US3377459A (en) * 1967-03-01 1968-04-09 Brown Fintube Co Method and apparatus for helically welding strip material

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE423356C (de) * 1925-01-31 1925-12-29 C G Haubold A G Vorrichtung zum schraubenfoermigen Aufwickeln von Rippen auf Rohre
CH345320A (de) * 1956-06-26 1960-03-31 Kuehni Apparatebau Ag Verfahren zur Herstellung eines Rippenrohres und Vorrichtung zur Ausübung dieses Verfahrens

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1570117A (en) * 1922-12-30 1926-01-19 Schutte & Koerting Co Apparatus for applying helical ribs to pipes
US3377459A (en) * 1967-03-01 1968-04-09 Brown Fintube Co Method and apparatus for helically welding strip material

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4336642A (en) * 1974-12-24 1982-06-29 B.V. Machinefabriek Breda V/H Backer & Rueb Method of enlarging the heat exchange surface of a tubular element
US4203205A (en) * 1976-12-27 1980-05-20 Spirec l'Echangeur Spirale Ever Clean Method and apparatus for the manufacture of a heat exchanger
US4259771A (en) * 1978-03-24 1981-04-07 Nishiyodo Air Conditioner Co., Ltd. Apparatus for producing heat transfer tube
US4352227A (en) * 1980-05-20 1982-10-05 Nishiyodo Air Conditioner Co., Ltd. Apparatus for producing a finned tube for heat transfer
US5423121A (en) * 1994-01-18 1995-06-13 Mcelroy Manufacturing, Inc. Automated fin tube process
US5781987A (en) * 1994-09-16 1998-07-21 Retermia Oy Apparatus for manufacturing a needle-rib heat-exchanger construction
US5679106A (en) * 1994-12-26 1997-10-21 Nippondenso Co., Ltd. Roller for forming corrugated fin
US6851188B2 (en) * 2001-11-02 2005-02-08 Heidelberger Druckmaschinen Ag Method for making a low inertia roll
US20050054500A1 (en) * 2001-11-02 2005-03-10 Goss International Americas, Inc. Low inertia roll
US8128544B2 (en) 2001-11-02 2012-03-06 Goss International Americas, Inc. Low inertia roll
US20170074600A1 (en) * 2014-05-16 2017-03-16 Henan New Kelong Electrical Appliances Co., Ltd Spiral louver shaped condenser with multilayer spatial structure
US10072899B2 (en) * 2014-05-16 2018-09-11 Henan New Kelong Electrical Appliances, Co., Ltd. Spiral louver shaped condenser with multilayer spatial structure

Also Published As

Publication number Publication date
GB1355902A (en) 1974-06-12
FR2128337A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-10-20
BE780073A (nl) 1972-07-03
IT952893B (it) 1973-07-30
SE369381B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-08-26
FR2128337B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1975-10-24
DE2110306A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-03-09
DE2110306B2 (de) 1972-03-09
NL7202197A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-09-06

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