US3890584A - Means for sealing the crimped end portion of a wave guide - Google Patents

Means for sealing the crimped end portion of a wave guide Download PDF

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Publication number
US3890584A
US3890584A US379054A US37905473A US3890584A US 3890584 A US3890584 A US 3890584A US 379054 A US379054 A US 379054A US 37905473 A US37905473 A US 37905473A US 3890584 A US3890584 A US 3890584A
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Prior art keywords
conductor
end portion
land
lands
inward
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Expired - Lifetime
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US379054A
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English (en)
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Georg Spinner
Franz X Pitschi
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/085—Cable junctions for coaxial cables or hollow conductors
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S285/00—Pipe joints or couplings
    • Y10S285/91—Gaskets

Definitions

  • a wave guide fitting has a crimped over end cut axially between the end face of an attachment part and the shaped part forming the conductor part forming a continuation of the structure.
  • the shaped part makes contact with the end via a radially inner annular land. with the interposition of a seal, which is placed in a groove in the end annular surface of the attachment part and has two pressing edges. Of these edges the radially inner one rests on the rear side of the crimped over end and the radially outer one rests on the end face of the continuing conductor part.
  • the seal is constructed as a membrane-like disc, on which as pressing edges sealing lands are molded with a radial spacing between them.
  • the disc which is matched to suit the shape of the attachment flanges, has a further external sealing land, which rests against one of these flanges and provides for external sealing of the intermediate space between the two metal parts.
  • the invention relates to a fitting for preferably oval, corrugated wave guides whose crimped over end is cut axially and is then positioned between the end face of an attachment part and the shaped part that forms part of the conductor that forms a continuation of the structure.
  • the shaped part of the conductor makes contact with the crimped over end via a radially inner annular land, located on a sealing means which sealing means is placed in a groove in the end annular surface of the attachment part.
  • the sealing means has two pressing lands, of which the radially inner one rests on the rear side of the crimped over end and the radially outerone rests on the end face of the continuing conductor part.
  • the Prior Art Such a fitting is described in the German Patent Specification No. 1,490,798 published June I9, 1969.
  • the sealing ring used in that case has the crosssectional shape of a numeral 3.
  • the free limbs of the sealing ring rest against the bottom of the groove and the sealing edges or lands are formed by the transitional curves.
  • the two sealing edges or lands lie immediately adjacent to each other.
  • high quality shaping of the edge of the crimped over end of the hollow conductor or wave guide is necessary.
  • one sealing function does not by way of example occur if the sealing edge or land (i.e.
  • the guide In order to ensure this desired contact with radially outer edge of the crimped over end of the corrugated tube wave guide, the guide must be exactly trimmed to size, something which necessitates very difficult machining operations, and in this respect it must be taken into account that the assembly cannot always be carried out by means ofa template, and instead must frequently be undertaken simply by using a hammer.
  • the seal is constructed as a membrane-like disc, on which as pressing edges sealing lands are molded with a significant radial spacing be tween them and in that the disc which is matched to suit the shape of the attachment flanges of the conductor part and the attachment part, has a further external sealing land, which rests against one of these flanges and provides for external sealing of the intermediate space between the two metal parts.
  • This construction is intended to ensure that the two inner sealing edges rest individually on the surfaces which are allocated to them, even though the crimped over edge of the wave guide is not precisely trimmed to size.
  • the scaling lands are held by the membrane-like disc supporting them with their predetermined safety spacing, and however owing to the flexibility of the disc each sealing land can fulfill its individual sealing function without any mutual interference having to be feared.
  • the outer sealing arrangement prevents the access of moisture into the cavity between the two fitting parts. Therefore, three separate sealing systems, only held together by the central membrane, are formed, and the distance between the two inner sealing lands on the rear side ofthe crimp disc can be made so large that irregularities in the crimp disc, which can occur with out it being possible to avoid them, cannot lead to any leaks.
  • the outer sealing land can run parallel to the inner sealing land and be oval like it. Instead of this it can however also be circular and therefore for large extents have a still greater safety distance between it and the inner sealing land.
  • the sealing disc preferably consists of silicone rubher.
  • annular cavity between the attachment part and the corrugated tube is filled with an elastic self hardening material or composition so that an air and moisture tight seal is formed between the corrugated tube, or the casing surrounding it respectively, and the attachment part.
  • an elastic self hardening material or composition so that an air and moisture tight seal is formed between the corrugated tube, or the casing surrounding it respectively, and the attachment part.
  • a relatively hard synthetic resin can be used.
  • the corrugated casing is cut obliquely in a plane corresponding to the pitch of the helix of the corrugated casing so that the crimped over end is broadened out at all positions of the periphery as far as the same concentric oval.
  • FIG. 1 is a section of a wave guide or hollow conductor fitting with a seal, constructed in accordance with the invention, on the line II (FIG. 2).
  • FIG. 2 shows a view from the cable side of the sealing disc.
  • FIG. 3 shows a section on the line IIIIII in accordance with FIG. 2.
  • FIG. 4 shows a section corresponding to FIG. I of a wave guide fitting with a sealing ring between the cable and the anchoring means.
  • FIG; 5 shows a section on the line V-V in accordance with FIG. 4.
  • FIG. 6 is a sectional view of the end of the corrugated tube.
  • the corrugated casing of the cable is surrounded by a plastic casing 12, which has been removed in the front or right hand section.
  • an attachment part I4 provided with an inner contour of a suitable shape, is placed as a head part or anchoring part.
  • This attachment part has a radially inner narrow end contacting land 16, with which the outwardly widened and crimped over end 18 of the corrugated tube casing 10 is pressed against the end contact annular surface 20 of the continuing conductor part 22, which can be constructed as a transitional transformer.
  • the two parts l4 and 22 are pressed against each other by tightening or clamping screws 24, which pass through holes of the annular flanges of both parts.
  • the end annular face of the attachment part 14 has a groove 26 similar to the transitional form of the corrugated tube radially outside the contact ring land 16.
  • a sealing disc 28 in accordance with FIGS. 2 and 3 is provided, which corresponds internally to the shape of the hollow conductor 10 and externally is constructed in accordance with the flanges of the attachment part and the continuing conductor part, that is to say circularly.
  • This sealing disc 28 consists of a flexible membrane 30, which carries sealing lands on both sides. The radially inner limit is formed by a sealing land 32, which on the cable facing side rests on the bottom of the groove 26 and on the other side lies against the crimped over end 18 of the wave guide tube.
  • sealing land 34 With a radial spacing from the sealing land 32 there is a sealing land 34, which on the cable facing side again lies against the inside surface of the groove 26 and on the other side lies against the end face 20 of the continuing conductor part 22.
  • the sealing land 34 can be oval so as to correspond to the land 32, as is shown in FIG. 2. Instead of this the sealing land can however be made circular.
  • the membrane connecting the sealing land does not lie in the center, but is laterally offset in such a manner that the sealing part on the cable facing side of the lands is longer than the oppositely placed one in accordance with FIG. 3, right-hand part of the lands.
  • the end face of the attachment part 14 can be provided with an oval double groove or with an oval and a circular groove in order to accept the separate sealing lands 32 and 34 individually.
  • the sealing disc is limited by a circular sealing strip 36, which again projects to both sides of the membrane, that is to say on the right-hand side in terms of FIG. 3 to the same extent as the sealing strips 32 and 34, while the left-hand edge of the sealing strip 36 is set back somewhat as compared with the lefthand edges of the sealing strips 32, 34.
  • the sealing land 36 is passed around the passage holes 38 for the bolts 24 in a section 37. The diameter of these holes 38 is less than the diameter of the screws 24 so that the sealing disc prevents the screws from falling out in the disassembled condition of the unit.
  • the space between the corrugated tube casing 10, or the plastic casing 12 respectively, and the attachment sleeve portion of the attachment part. which is behind the corrugated tube section 40 is filled with a elastic 4 self-curing composition 42, which is injected through a hole which can be closed by an inserted screw 44.
  • sealing strip 34 Between the end face of the attachment part 14 and the end face of the continuing conductor part 22: sealing strip 34.
  • the axial extent of the right-hand part of the sealing land 34 is greater than the extent of the inner sealing land 32 by an amount equal to the thickness of the corrugated tube or its crimped on end so that the sealing pressure at the crimped over end and at the end face is equal.
  • FIG. 4 shows an embodiment which is modifled as regards the seal between the corrugated casing and the anchoring means so as to depart from the embodiment in accordance with FIG. I.
  • oval sealing rings 52 with a circular cross-section are inserted between the casing 12 and the attachment sleeve of attachment part 14. Rings 52, rest on a step 54 of the attachment part 14.
  • the axial clamping action is car ried out by means of a support sleeve 56 with an oval form (FIG. 5), which is carried by a circular flange 58.
  • This annular flange is axially clamped by a nut 60 with an internal collar axially.
  • a template saw which makes an oblique cut in accordance with the pitch of the helical line of the corrugations of the cable so that after the crimping over the crimped over edge extends as far as an oval 62 lying concentrically in relation to the sealing land 32.
  • the line of cut is denoted by reference numeral 64 in FIG. 6.
  • the crimping over is carried here around the end face denoted with reference numeral 66.
  • the cut is carried out as far as the narrow side of the oval and as far as the longitudinal axis of the oval.
  • the cut is carried out in such a manner that the crimped over edge which is formed runs symmetrically with respect to the center axis of the oval.
  • Means for securing the crimped end of a wave guide comprising:
  • a wave guide comprised of an annular, tubular conductor, said conductor having an end portion that is to be crimped and secured;
  • attachment part a separate conductor part for serving as a continuation of said conductor; said attachment part and said conductor part having respective opposed end faces defining an annular gap therebetween.
  • said attachment part and said conductor part being oriented and positioned such that said conductor end portion is crimped so as to be oriented to extend generally radially outwardly of said conductor and said conductor end portion is in said gap between said opposed end faces;
  • sealing element having a radially more inwardly located annular sealing land extending around it and extending axially of said conductor toward said conductor part end face; said sealing element also having a radially more outwardly located annular sealing land extending around it and extending axially of said conductor toward said conductor part end face; said inward and said outward lands being spaced apart radially a first distance; both said sealing element lands project both toward said conductor part from one side of said sealing element and toward said attachment part from the opposite side of said sealing element;
  • said conductor end portion being of a length such that it extends radially outward so as to be between said inward land and said conductor part end face; said conductor end portion having an end edge and said end portion being of a length such that said end edge is between said inward and said outward lands;
  • the lengths axially of said conductor of said lands on the said attachment part side of said sealing element are greater than the lengths axially of said conductor of the respective said lands on said conductor part side of said sealing element; said sealing element being of a thickness and said lands being of a length axially of said conductor on said conductor part side of said sealing element and said sealin g elements having such flexibility that said inward land clamps said conductor end portion against said conductor part end face and said outward land clamps against said conductor part end face without contacting said conductor end portion',
  • said first radial distance between said inward and outward lands being great enough to cause said lands to be separated from each other a distance at their respective clamping surfaces with said conductor end portion and with said conductor part end face to provide such clearance as to maintain the recited relationship of said conductor end portion with said inward and outward lands despite normal non-uniformity of said radial length of said conductor end portion.
  • Means for securing the crimped end of a wave guide comprising:
  • a wave guide comprised of an annular, tubular conductor, said conductor having an end portion that is to be crimped and secured;
  • attachment part a separate conductor part for serving as a continuation of said conductor; said attachment part and said conductor part having respective opposed end faces defining an annular gap therebetween, said attachment part and said conductor part being oriented and positioned such that said conductor end portion is crimped so as to be oriented to extend generally radially outwardly of said conductor and said conductor end portion is in said gap between said opposed end faces;
  • sealing element having a radially more inwardly located annular sealing land extending around it and extending axially of said conductor toward said conductor part end face; said sealing element also having a radially more outwardly located annular sealing land extending around it and extending axially of said conductor toward said conductor part end face; said inward and said outward lands being spaced apart radially a first distance;
  • said conductor end portion being of a length such that it extends radially outward so as to be between said inward land and said conductor part end face; said conductor end portion having an end edge and said end portion being of a length such that said end edge is between said inward and said outward lands;
  • sealing element being of a thickness and said lands being of a length axially of said conductor and said sealing elements having such flexibility that said inward land clamps said conductor end portion against said conductor part end face and said outward land clamps against said conductor part end face without contacting said conductor end portion;
  • the length axially of said conductor of said inward land is preformed to be shorter than the preformed length axially of said conductor of said outward land by the thickness of said conductor end portion as said conductor passes between said inward land and said conductor part end face;
  • said first radial distance between said inward and outward lands being great enough to cause said lands to be separated from each other a distance at their respective clamping surfaces with said conductor end portion and with said conductor part end face to provide such clearance as to maintain the recited relationship of said conductor end portion with said inward and outward lands despite normal non-uniformity of said radial length of said conductor end portion.
  • Means for securing the crimped end of a wave guide comprising: a wave guide comprised of an annular, tubular conductor, said conductor having an end portion that is to be crimped and secured;
  • attachment part a separate conductor part for serving as a continuation of said conductor; said attachment part and said conductor part having respective opposed end faces defining an annular gap therebetween, said attachment part and said conductor part being oriented and positioned such that said conductor end portion is crimped so as to be oriented to extend generally radially outwardly of said conductor and said conductor end portion is in said gap between said opposed end faces;
  • said sealing element having a radially more inwardly located annular sealing land extending around it and extending axially of said conductor toward said conductor part end face; said sealing element also having a radially more outwardly located annular sealing land extending around it and extending axially of said conductor toward said conductor part end face; said inward and said out' ward lands being spaced apart radially a first dis tance; said conductor end portion being of a length such that it extends radially outward so as to be between said inward land and said conductor part end face; said conductor end portion having an end edge and said end portion being of a length such that said end edge is between said inward and said outward lands; said sealing element being of a thickness and said lands being of a length axially of said conductor and said sealing elements having such flexibility that said inward land clamps said conductor end portion against said conductor part end face and said outward land clamps against said conduct
  • attachment means for fastening said attachment part and said conductor part together; receiving holes extending into both said attachment part and said conductor part, extending through said end faces and aligned across said gap between said end faces; said attachment means being secured in said receiving holes;
  • the means for securing the crimped end of a wave guide of claim 4 further comprising a sealing sleeve section of said attachment part and surrounding said conductor and extending away from said conductor part; said sealing sleeve being of a size to define a sealable gap between said sealing sleeve and said conductor; an elastic, self-curing composition in said sealing gap for sealing it.
  • Means for securing the crimped end of a wave guide comprising:
  • a wave guide comprised of an annular, tubular conductor, said conductor having an end portion that is to be crimped and secured;
  • attachment part a separate conductor part for serving as a continuation of said conductor; said attachment part and said conductor part having respective opposed end faces defining an annular gap therebetween, said attachment part and said conductor part being oriented and positioned such that said conductor end portion is crimped so as to be oriented to extend generally radially outwardly of said conductor and said conductor end portion is in said gap between said opposed end faces;
  • sealing element having a radially more inwardly located annular sealing land extending around it and extending axially of said conductor toward said conductor part end face; said sealing element also having a radially more outwardly located annular sealing land extending around it and extending axially of said conductor toward said conductor part end face; said inward and said outward lands being spaced apart radially a first distance;
  • said conductor end portion being of a length such that it extends radially outward so as to be between said inward land and said conductor part end face; said conductor end portion having an end edge and said end portion being of a length such that said end edge is between said inward and said outward lands;
  • sealing element being of a thickness and said lands being of a length axially of said conductor and said sealing elements having such flexibility that said inward land clamps said conductor end portion against said conductor part end face and said outward land clamps against said conductor part end face without contacting said conductor end portion;
  • said first radial distance between said inward and outward lands being great enough to cause said lands to be separated from each other a distance at their respective clamping surfaces with said conductor end portion and with said conductor part end face to provide such clearance as to maintain the recited relationship of said conductor end portion with said inward and outward lands despite normal non-uniformity of said radial length of said conductor end portion;
  • sealing sleeve section of said attachment part surrounding said conductor and extending away from said conductor part; said sealing sleeve being of a size to define a sealable gap between said sealing sleeve and said conductor;
  • sealing ring in said scalable gap; said sealing ring being shaped to sealingly pass around the exterior of said conductor and being of a generally circular cross-section and being of a thickness to seal closed said scalable gap.
  • said ring compression means comprise means movable along said conductor toward said conductor part and includes an abutment on said movable means that is biasable against said sealing ring; means in said sealable gap for restraining said sealing ring against movement under bias of said ring compression means.
  • Means for securing the crimped end of a wave guide comprising:
  • a wave guide comprised of an annular, tubular conductor, said conductor having an end portion that is to be crimped and secured;
  • attachment part a separate conductor part for serving as a continuation of said conductor; said attachment part and said conductor part having respective opposed end faces defining an annulargap therebetween, said attachment part and said conductor part being oriented and positioned such that said conductor end portion is crimped so as to be oriented to extend generally radially outwardly of said conductor and said conductor end portion is in said gap between said opposed end faces;
  • sealing element in said gap, said sealing element having a radially more inwardly located annular sealing land extending around it and extending axially of said conductor toward said conductor part end face; said sealing element also having a radially more outwardly located annular sealing land extending around it and extending axially of said conductor toward said conductor part end face; said inward and said outward lands being spaced apart radially a first distance;
  • said conductor end portion being of a length such that it extends radially outward so as to be between said inward land and said conductor part end face; said conductor end portion having an end edge and said end portion being of a length such that said end edge is between said inward and said outward lands;
  • sealing element being of a thickness and said lands being of a length axially of said conductor and said sealing elements having such flexibility that said inward land clamps said conductor end portion against said conductor part end face and said outward land clamps against said conductor part end face without contacting said conductor end portion;
  • said first radial distance between said inward and outward lands being great enough to cause said lands to be separated from each other a distance at their respective clamping surfaces with said conductor end portion and with said conductor part end face to provide such clearance as to maintain the recited relationship of said conductor end portion with said inward and outward lands despite normal non-uniformity of said radial length of said conductor end portion;
  • said conductor being ovular in shape and at least said inward land being coaxially ovular to said conductor and being correspondingly shaped;
  • said conductor end portion having a free end edge which is cut off obliquely such that when said end portion is crimped into said gap, said end portion extends radially outwardly from the fold of the crimp generally a constant distance annularly around said end portion.

Landscapes

  • Installation Of Indoor Wiring (AREA)
  • Joints That Cut Off Fluids, And Hose Joints (AREA)
  • Measuring Fluid Pressure (AREA)
  • Waveguide Aerials (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
US379054A 1972-08-03 1973-07-13 Means for sealing the crimped end portion of a wave guide Expired - Lifetime US3890584A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2238268A DE2238268C3 (de) 1972-08-03 1972-08-03 Armatur für einen Wellrohrhohlleiter

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US3890584A true US3890584A (en) 1975-06-17

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US379054A Expired - Lifetime US3890584A (en) 1972-08-03 1973-07-13 Means for sealing the crimped end portion of a wave guide

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US (1) US3890584A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS5343687B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2238268C3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2195096B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1401409A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5551066U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1978-09-27 1980-04-03
US4946206A (en) * 1989-02-27 1990-08-07 Prinsco, Inc. Bidirectional corrugated pipe-rib seal
US5505495A (en) * 1993-01-07 1996-04-09 Hutchinson Watertight coupling between a tube and an endpiece
EP1099892A1 (de) * 1999-11-09 2001-05-16 Witzenmann GmbH Metallschlauch-Fabrik Pforzheim Abdichtung zwischen zueinander koaxialen axialsymmetrischen Querschnitten von Bauteilen
US20100090459A1 (en) * 2006-11-21 2010-04-15 Titeflex Corporation Quick actuating fitting for corrugated stainless steel tubing
CN108963954A (zh) * 2018-08-29 2018-12-07 3M中国有限公司 密封组件和充油式电缆终端

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2502328C3 (de) * 1972-08-03 1982-03-25 Spinner-GmbH Elektrotechnische Fabrik, 8000 München Armatur für einen Hohlleiter
US4173349A (en) * 1978-08-24 1979-11-06 General Motors Corporation Connector interface sealing arrangement
DE3522736C1 (de) * 1985-06-25 1987-02-19 Spinner Gmbh Elektrotech Vorrichtung zum druckdichten Verbinden des Aussenleiters einer Koaxialleitung
US7420443B2 (en) 2006-05-10 2008-09-02 Commscope, Inc. Of North Carolina Waveguide interface adapter and method of manufacture

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US508765A (en) * 1893-11-14 Steam-tight coupling
US741808A (en) * 1903-02-13 1903-10-20 Pfaudler Co Inc Packing.
US3070649A (en) * 1960-06-14 1962-12-25 Phelps Dodge Copper Prod Coaxial cable coupling

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1490798B2 (de) * 1964-06-24 1970-11-26 Telefunken Patentverwertungsgesellschaft Mbh, 7900 Ulm Steckerarmatur für einen biegsamen Wellrohrhohlleiter
US3367682A (en) * 1964-10-19 1968-02-06 Aerojet General Co Sealed joint employing pressure loaded and mechanically loaded seal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US508765A (en) * 1893-11-14 Steam-tight coupling
US741808A (en) * 1903-02-13 1903-10-20 Pfaudler Co Inc Packing.
US3070649A (en) * 1960-06-14 1962-12-25 Phelps Dodge Copper Prod Coaxial cable coupling

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5551066U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1978-09-27 1980-04-03
US4946206A (en) * 1989-02-27 1990-08-07 Prinsco, Inc. Bidirectional corrugated pipe-rib seal
US5505495A (en) * 1993-01-07 1996-04-09 Hutchinson Watertight coupling between a tube and an endpiece
US5749995A (en) * 1993-01-07 1998-05-12 Hutchinson Watertight coupling between a tube and an endpiece and method of manufacturing it
EP1099892A1 (de) * 1999-11-09 2001-05-16 Witzenmann GmbH Metallschlauch-Fabrik Pforzheim Abdichtung zwischen zueinander koaxialen axialsymmetrischen Querschnitten von Bauteilen
US20100090459A1 (en) * 2006-11-21 2010-04-15 Titeflex Corporation Quick actuating fitting for corrugated stainless steel tubing
CN108963954A (zh) * 2018-08-29 2018-12-07 3M中国有限公司 密封组件和充油式电缆终端

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Publication number Publication date
FR2195096B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1978-07-07
DE2238268A1 (de) 1974-02-14
DE2238268C3 (de) 1980-01-31
GB1401409A (en) 1975-07-16
DE2238268B2 (de) 1979-05-31
JPS5343687B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1978-11-22
FR2195096A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-03-01
JPS49132613A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-12-19

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