US3644162A - Tire-building drum - Google Patents

Tire-building drum Download PDF

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Publication number
US3644162A
US3644162A US52232A US3644162DA US3644162A US 3644162 A US3644162 A US 3644162A US 52232 A US52232 A US 52232A US 3644162D A US3644162D A US 3644162DA US 3644162 A US3644162 A US 3644162A
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US
United States
Prior art keywords
segments
pair
axis
links
shaft
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
US52232A
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English (en)
Inventor
Paul E Appleby
Denver C Folden
Robert S Riggs
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.)
Goodyear Tire and Rubber Co
Original Assignee
Goodyear Tire and Rubber Co
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Publication date
Application filed by Goodyear Tire and Rubber Co filed Critical Goodyear Tire and Rubber Co
Application granted granted Critical
Publication of US3644162A publication Critical patent/US3644162A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/24—Drums

Definitions

  • FIG. 1 is a longitudinal cross-sectional view of a tire-building drum constructed in accordance with the present invention
  • FIG. 2 is an end view as viewed at 2-2 in FIG. 1;
  • FIG. 3 is an end view similar to FIG. 2 but with the drum in collapsed condition
  • FIG. 4 is a fragmentary, enlarged, cross-sectional view substantially along the line 4-4 of FIG. 1.
  • a drum constructed in accordance with the present invention comprises an elongated tubular shaft of circular cross section. Disposed coaxially within the shaft 10 is a lead screw 12 having two portions 14 and 16 of opposite hand. The lead screw portions 14 and 16 are joined together by coupling 18 to provide for simultaneous rotation of the lead screw portions. A pair of lead nuts 20, 22 are threaded over the lead screw portions 14 and 16, respectively, whereby rotation of the lead screw 12 in one direction will effect simultaneous but opposite movement of the lead nuts 20, 22 in directions axially of the shaft 10.
  • the lead nuts 20, 22 have cylindrical outer surfaces which are slidingly engaged with the inner cylindrical surface of the shaft 10.
  • each of the members 24 and 26 Disposed concentrically about the shaft 10 are a pair of sleevelike members 24, 26 which are supported by friction bearings as at 28 for sliding movement longitudinally of and along the outer cylindrical surface of the shaft 10.
  • the outer surface of each of the members 24 and 26 is polygonal and is in the specific embodiment as shown in FIG. 2 substantially hexagonal to provide six flat surfaces, as at 30, disposed equiangularly about the axis of the shaft 10.
  • a pair of pins 34 are carried by two of the blocks 32 associated with each of the sleeves 24, 26.
  • each pin 34 extends radially of the axis of the shaft 10, and each pin, at its outer end, is provided with a circular flange by means of which the pin is bolted or otherwise suitably fixed to the underlying block 32.
  • the main body of each pin 34 is round in cross section and extends radially of the axis of the shaft 10 in alignment with the other pin associated with the same sleeve 24, 26.
  • Each pin 34 extends through the block 32 mounting the same and through the sleeve 24, 26 and then through an elongated slot 36 extending longitudinally of and through the wall of the shaft 10, there being one such slot associated with each pin.
  • Each pin 34 is engaged at its inner end within a recess in one of the lead nuts 20, 22 which serves to fix the lead nut against rotation about the axis of the shaft 10. Accordingly, as the lead screw 12 is rotated in either of both directions of movement thereof, the sleeves 22, 24 will be 7 simultaneously moved longitudinally of the shaft 10, and in the specific embodiment will be moved in opposite directions.
  • a first series of segments 40 disposed concentrically of and spaced radially outwardly of the shaft 10 disposed concentrically of and spaced radially outwardly of the shaft 10 is a first series of segments 40 disposed equiangularly about the axis of the shaft 10. In the specific embodiment there are three such segments, and each comprises a base 42 on which is mounted a pair of shell members 44, 46.
  • Each of the shell members is particylindrical in shape with the outer surface thereof disposed concentrically of the axis of the shaft 10.
  • Each of the shell members is releasably mounted on its base 42 by means of a bolt 48 extending outwardly of the drum axis through an elongated slot 50 in the base and threadedly engaged in a recess in the shell member.
  • the slot 50 extends parallel to the axis of the shaft 10, whereby upon loosening of the bolt 48, the respective shell member may be adjusted longitudinally of the shaft axis within the limits of the length of the slot 50.
  • Each shell member is provided with additional threaded recesses 52 selectively engageable by the bolt 48 to permit further adjustment of the shell member parallel to the shaft axis to provide for different overall drum lengths.
  • a spacer 54 is disposed between the next adjacent ends of each associated pair of shell members 44, 46 and is releaseably mounted on the base 42. The spacer is removable and may be replaced by a spacer of different width, as measured axially of the drum, so as to fill the space between the next adjacent ends of the shell members when the same are adjusted farther apart to increase the overall drum length.
  • a second series of segments 56 are disposed about the shaft axis in radially spaced relation thereto and are interposed respectively between the segments 40 of the first series thereof; in other words, the segments 40 and 56 are arranged alternately about the shaft axis.
  • Each segment 56 comprises a base 58 similar to the base 42 and a pair of shell members 60, 62 similar to the shell members 44, 46 previously described.
  • a spacer 64 similar to the spacer 54, is provided for each segment 56.
  • the shell members 60, 62, as well as the spacer 64, are mounted on the base 58 in the same manner as described in connection with the shell members 44, 46 and spacer 54.
  • the shell members 60, 62 are somewhat wider, as measured circumferentially of the drum, than the shell members 44, 46.
  • the edge portions of each of the shell members 60, 62 which extend parallel to the axis of the shaft 10 are beveled so as to lie in a plane extending generally in a chordwise direction relative to the external surface of the shell member.
  • the beveled edge portions of the shells 60, 62 are in overlapping engagement with mating surfaces extending along the corresponding edge portions of the shell members 44, 46 when the segments are in drum expanded condition as viewed in FIG. 2, at which time the external surfaces of the segments 40 and 56 collectively define a cylindrical building surface disposed concentrically of the axis of the shaft 10.
  • a central hub 66 Disposed between the sleeve members 24 and 26 is a central hub 66 comprising a generally cylindrical, tubular center portion 68 disposed coaxially over the shaft 10 and fixed relative thereto by suitable means, as at 70.
  • the hub 66 terminates at its opposite ends in a pair of radially outwardly extending circular flanges 69, 71 which in turn terminate at their radially outer ends in generally annular block portions 72, 74 which are spaced radially outwardly from the shaft 10.
  • Each of the segments 40, 56 have a pair of pistons 76, 78 depending from the base 42, 58 thereof. Each such pair of pistons is suitably fixed to its associated base member and extends radially of the axis of the shaft 10.
  • the pistons of each pair thereof are aligned in a plane containing the shaft axis, and are spaced apart axially of the drum with the pistons of each pair received respectively in cylinders in the block portions 72, 74 of the hub 66, the cylinders extending through the block portions 72, 74 in a direction radially of the shaft axis.
  • each of the segments is pivotally connected to one end of a pair of links the other end of which are pivotally connected to the sleeve members 24, 26.
  • each piston 76 associated with a segment 40 is in the form of a cylindrical bar and has a slot 80 extending longitudinally therethrough and radially partially therethrough.
  • Each of the cylinders receiving the pistons 76 has a similar slot in the wall thereof extending the full length of the cylinder and registering with the slot 80 with the piston.
  • Received within each slot 80 in each piston 76 is a link 82.
  • each link 82 is pivotally mounted on the associated piston 76 for movement about an axis extending at right angles to and radially spaced from the axis of the shaft 10.
  • the other or inner end of each link 82 is pivotally connected to a projection 84 on an associated one of the block members 32 for movement about an axis extending parallel to the pivotal axis of the outer end of the link.
  • the block portions 72, 74 of the hub 66 are spaced radially outwardly of the shaft a distance sufficient to provide clearance for the projections 84 to be disposed between the block portions and the shaft 10 when the drum is in expanded condition, as shown in FIG. 1.
  • FIG. 1 As will also be seen from FIG.
  • each link 82 when the drum is in its expanded condition, the links 82 are on center; or in other words, the pivotal axes of each link lie in a common plane extending at right angles to the axis of the shaft 10.
  • Each of the links 82 is generally rectangular in cross section and has a thickness less than the width of the slots 80 and 83 in the pistons 76 and block portions 72, 74, for a purpose which will be hereinafter apparent.
  • Movement of the segments 56 radially of the drum axis is effected in a manner similar to movement of the segments 40. More particularly, a pair of links 86 are associated with each segment 56 and are pivotally connected at their outer ends to the segments for movement about axes extending at right angles to an spaced radially from the axis of the shaft 10. The inner ends of the links 86 are pivotally mounted on projections 88 extending from associated ones of the blocks 32 interposed between the blocks 32 associated with the links 82 and segments 40. The pivotal axis of the inner end of the links 86 is parallel to the pivotal axis at the outer end of these links.
  • the pistons 78 are of a construction similar to the pistons 76 and are provided with slots 90 similar to and for the same purpose as the slots 80 and the pistons 76. Further, the block portions 72 and 74 are provided with slots 92 in association with the cylinders therein receiving the pistons 78 with the slots 92 being similar in structure and function to the slots 83 previously described.
  • the slots 90 and 92 have a width which is greater than the thickness of the links 86 to permit the links to be disposed within the slots in the pistons.
  • the outer ends of the links 86 are pivotally mounted to the pistons 78 which are in turn fixed relative to the bases 58 of the segments 56.
  • the drum will be in its expanded condition as shown in FIGS. 1 and 2 during the building of a tire thereon.
  • the drum is collapsed for the removal of the tire therefrom.
  • the collapse of the drum is accomplished by rotating the lead screw 12 in a direction to cause simultaneous movement of the sleeves 24, 26 longitudinally of the axis of the drum.
  • rotation of the shaft 10 is accomplished by insertion of a suitable tool in one of a plurality of holes 100 in a disc 102 fixed relative to one end of the shaft 10.
  • the holes 100 are arranged in a circle concentric with the shaft axis.
  • One end of the screw 12 is provided with a tool engageable portion 104 by means of which the screw may be rotated while the shaft is held stationary by a suitable tool engaged in one or more of the holes 100.
  • the sleeves will simultaneously move in opposite directions axially of the drum, and more particularly will move in opposite directions and axially outwardly of the drum.
  • This movement of the sleeves will draw the inner ends of the links 82 axially outwardly of the drum with attendant radial movement of the pistons 76 and their associated segments 40.
  • the segments 56 the initial axial outward movement of the inner ends of the links 86 will cause the segments 56 to move radially outwardly a small amount and then move radially inwardly of the drum axis.
  • This action of the segments 56 is due to the fact that the pivot axes at the inner ends of the links 86 are spaced axially inwardly of the drum relative to the pivot axes at the outer end of the links when the drum is in its expanded condition, shown in FIGS. 1 and 2. Accordingly, during initial movement of the inner ends of the links in an axially outward direction and until the links pass through their oncenter condition, the segments 56 will move upwardly whereupon continued outward movement of the inner ends of the links 86 will cause the segments 56 to move radially inwardly.
  • the lead screw 12 is rotated in the opposite direction effecting simultaneous axially inward movement of the sleeves 24 with corresponding movement of the inner ends of the links 82 and 86.
  • the links 82 return from the dotted line position shown in FIG. 1 to the solid line oncenter position.
  • the links 86 also move from the dotted line position shown in FIG. 1 toward and through an oncenter position and beyond to the solid line position shown in FIG. 1.
  • the links 86 move through center in a togglelike manner whereby the segments 56 are moved to a radius slightly greater than that shown in FIGS. 1 and 2 and are then moved inwardly into overlapping engagement with the segments 40.
  • Axially inward movement of the sleeves 24, 26 is limited by engagement of the projections 88 of the blocks 32 associated with the links 86 with the flanges 68 and 70 on the center hub 66.
  • a collapsible tire-building drum comprising an elongated rotatable shaft; a first series of segments disposed in angularly spaced relation about the shaft and each having an arcuate external surface disposed concentrically of the shaft axis of rotation; a second series of segments disposed about said axis, the segments of said second series being interposed respectively between the segments of said first series and each having an arcuate external surface disposed concentrically of the shaft axis and forming with said external surfaces of the segments of said first series a continuous cylindrical building surface disposed concentrically of said axis; and means for effecting movement of said segments radially of said axis including a pair of links associated with each of said segments, one end of each link being pivotally connected to its respectively associated segment, a pair of members each movable longitudinally of said axis between first and second positions, the other ends of the links of each said pair thereof being pivotally connected respectively to said pair of members, the links associated with said first series of segments passing through center during movement of said
  • each segment includes a base and a pair of shell members disposed radially outwardly of the base with the shell members being disposed on opposite sides of the circumferential centerline of the drums, means for releaseably connecting each pair of shell members to its base and for varying the position of said shell members longitudinally of said axis, a replaceable spacer disposed between each pair of shell members, and releasable means mounting each spacer to its respective base.
  • each segment of said first series thereof has a pair of edge portions extending parallel to said axis and overlapping the next edge portions of the segments of said second series thereof when said members are in said first position thereof.
  • a tirebuilding drum as claimed in claim 1 further comprising a central hub fixed relative to said shaft, said hub having a pair of cylinders respectively associated with each segment, a pair of pistons respectively received in each pair of cylinders, each pair of pistons being fixed for movement with one of said segments.
  • a tire-building drum as claimed in claim 8 in which the pivotal axes of each link associated with said second series of segments are spaced apart a distance greater than the pivotal axes of said links associated with said first series of segments.
  • a tire-building drum comprising an elongated shaft, a hub coaxially disposed about the shaft and fixed relative thereto, a plurality of segments disposed about the shaft radially outwardly of said hub, said hub being provided with a pair of cylinders respectively associated with each segment, the pairs of cylinders being spaced apart angularly about the shaft axis with the cylinders of each pair being aligned in a plane containing the shaft axis and extending radially of said axis, a piston received in each said cylinder and fixed at one end relative to the respectively associated segment, said hub being provided with a plurality of slots respectively associated with said cylinders, said slots extending parallel to the axis of the cylinders and respectively opening thereinto, each piston having a slot extending parallel to and communicating with the slot in the respective cylinder, a link extending longitudinally of and received within each piston in alignment with the slots in the piston and cylinder, each link having a thickness less than the width of the slots in the respective piston and cylinder,
  • said means for moving the other ends of said links comprises a pair of members movable longitudinally thereof, the other end of one link of each pair being associated with one of said members, the other end of the other link of each pair being associated with the other of said members, said cylinders being contained within a pair of portions of said hub which are spaced radially outwardly of said shaft, each of said members having a plurality of projections extending between said portions of the hub and said shaft, the other ends of said links being pivotally mounted on said prpjections.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tyre Moulding (AREA)
US52232A 1970-07-06 1970-07-06 Tire-building drum Expired - Lifetime US3644162A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US5223270A 1970-07-06 1970-07-06

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US3644162A true US3644162A (en) 1972-02-22

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US52232A Expired - Lifetime US3644162A (en) 1970-07-06 1970-07-06 Tire-building drum

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US (1) US3644162A (enrdf_load_stackoverflow)
JP (1) JPS553133B1 (enrdf_load_stackoverflow)
BE (1) BE769536A (enrdf_load_stackoverflow)
CA (1) CA941276A (enrdf_load_stackoverflow)
DE (1) DE2134567A1 (enrdf_load_stackoverflow)
ES (1) ES391772A1 (enrdf_load_stackoverflow)
FR (1) FR2100246A5 (enrdf_load_stackoverflow)
GB (2) GB1303232A (enrdf_load_stackoverflow)
LU (1) LU63477A1 (enrdf_load_stackoverflow)
SE (2) SE375485B (enrdf_load_stackoverflow)
ZA (1) ZA713340B (enrdf_load_stackoverflow)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3779835A (en) * 1971-06-03 1973-12-18 Akron Standard Division Of Eag Building drum
US3867229A (en) * 1974-02-01 1975-02-18 Goodyear Tire & Rubber Tire building drum
US3867231A (en) * 1972-06-28 1975-02-18 Goodyear Tire & Rubber Tire building machine
US4126507A (en) * 1977-03-10 1978-11-21 Kim Vladimir A Tire-building drum
US4220494A (en) * 1977-10-28 1980-09-02 Bridgestone Tire Company Limited Tire building drum
US4711691A (en) * 1984-11-20 1987-12-08 Continental Gummi-Werke Aktiengesellschaft Tire build-up machine
US4855008A (en) * 1988-05-09 1989-08-08 The Goodyear Tire & Rubber Company Expandable tire building drum
US4859272A (en) * 1988-06-22 1989-08-22 The Goodyear Tire & Rubber Company Radial tire belt folding drum
US4906321A (en) * 1988-04-18 1990-03-06 Mccreary Tire & Rubber Company Drum for the formation of uncured tire sections thereon
US4929298A (en) * 1988-05-13 1990-05-29 The Goodyear Tire & Rubber Company Tire building drum including an expandable segmental cylinder assembly and a vacuum chamber
US4976804A (en) * 1989-05-05 1990-12-11 The Goodyear Tire & Rubber Company Expandable tire building drum
US5127979A (en) * 1988-04-18 1992-07-07 Mccreary Tire & Rubber Company Drum for the formation of uncured tire sections thereon
US5320701A (en) 1992-11-04 1994-06-14 Illinois Tool Works Inc. Tire building drum
US5354405A (en) * 1993-11-18 1994-10-11 Wyko, Inc. Bead lock drum for use in the manufacture of vehicle tires
US20090229752A1 (en) * 2006-05-19 2009-09-17 Toyo Tire & Rubber Co., Ltd. Band detaching method in band building drum and band building drum
US8555944B2 (en) 2010-07-09 2013-10-15 Davian Enterprises, LLC Anti-flex assembly
US9662847B2 (en) 2005-03-30 2017-05-30 Davian Enterprises, LLC Tire building drum having sequenced segment expansion
US9855715B2 (en) 2013-06-07 2018-01-02 Davian Enterprises, LLC Tire building drum with increased range of movement
US10040262B2 (en) 2014-02-07 2018-08-07 Davian Enterprises, LLC Expandable belt and tread drum with varied curvature segments
US10189221B2 (en) 2012-08-10 2019-01-29 Davian Enterprises, LLC Transfer ring shoe and transfer ring having varied shoe profile
US10421241B2 (en) * 2015-01-16 2019-09-24 Compagnie Generale Des Etablissements Michelin Drum for producing a tire blank
US11358356B2 (en) 2018-09-27 2022-06-14 Davian Enterprises, LLC Transfer ring with block and rail system
US11548251B2 (en) 2019-01-28 2023-01-10 Davian Enterprises, LLC Expandable belt and tread drum with reverse offset fingers
US11993043B2 (en) 2020-12-03 2024-05-28 Davian Enterprises, LLC Expandable belt and tread drum with magnetic deck fixing
US12083761B2 (en) 2020-04-22 2024-09-10 Davian Enterprises, LLC Shoulder assembly for tire building machine
US12162234B2 (en) 2020-05-29 2024-12-10 Davian Enterprises, LLC Transfer ring shoe and transfer ring with reduced air entrapment features

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2243897C1 (ru) * 2003-04-02 2005-01-10 Открытое акционерное общество "Волжский механический завод" Барабан для сборки покрышек, складывающийся в радиальном направлении силовыми цилиндрами

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3779835A (en) * 1971-06-03 1973-12-18 Akron Standard Division Of Eag Building drum
US3867231A (en) * 1972-06-28 1975-02-18 Goodyear Tire & Rubber Tire building machine
US3867229A (en) * 1974-02-01 1975-02-18 Goodyear Tire & Rubber Tire building drum
US4126507A (en) * 1977-03-10 1978-11-21 Kim Vladimir A Tire-building drum
US4220494A (en) * 1977-10-28 1980-09-02 Bridgestone Tire Company Limited Tire building drum
US4711691A (en) * 1984-11-20 1987-12-08 Continental Gummi-Werke Aktiengesellschaft Tire build-up machine
US4906321A (en) * 1988-04-18 1990-03-06 Mccreary Tire & Rubber Company Drum for the formation of uncured tire sections thereon
US5127979A (en) * 1988-04-18 1992-07-07 Mccreary Tire & Rubber Company Drum for the formation of uncured tire sections thereon
US4855008A (en) * 1988-05-09 1989-08-08 The Goodyear Tire & Rubber Company Expandable tire building drum
US4929298A (en) * 1988-05-13 1990-05-29 The Goodyear Tire & Rubber Company Tire building drum including an expandable segmental cylinder assembly and a vacuum chamber
US4859272A (en) * 1988-06-22 1989-08-22 The Goodyear Tire & Rubber Company Radial tire belt folding drum
US4976804A (en) * 1989-05-05 1990-12-11 The Goodyear Tire & Rubber Company Expandable tire building drum
US5320701A (en) 1992-11-04 1994-06-14 Illinois Tool Works Inc. Tire building drum
US5505803A (en) * 1993-11-18 1996-04-09 Wyko, Inc. Bead lock drum used in the manufacture of vehicle tires
US5354405A (en) * 1993-11-18 1994-10-11 Wyko, Inc. Bead lock drum for use in the manufacture of vehicle tires
US9662847B2 (en) 2005-03-30 2017-05-30 Davian Enterprises, LLC Tire building drum having sequenced segment expansion
US20090229752A1 (en) * 2006-05-19 2009-09-17 Toyo Tire & Rubber Co., Ltd. Band detaching method in band building drum and band building drum
US8771446B2 (en) * 2006-05-19 2014-07-08 Toyo Tire & Rubber Co., Ltd. Band detaching method in band building drum and band building drum
US8978728B2 (en) 2006-05-19 2015-03-17 Toyo Tire & Rubber Co. Ltd. Band detaching method in band building drum and band building drum
US8555944B2 (en) 2010-07-09 2013-10-15 Davian Enterprises, LLC Anti-flex assembly
US10189221B2 (en) 2012-08-10 2019-01-29 Davian Enterprises, LLC Transfer ring shoe and transfer ring having varied shoe profile
US9855715B2 (en) 2013-06-07 2018-01-02 Davian Enterprises, LLC Tire building drum with increased range of movement
US10328647B2 (en) 2013-08-12 2019-06-25 Davian Enterprises, LLC Expandable belt and tread drum having irregular segment profiles
US10040262B2 (en) 2014-02-07 2018-08-07 Davian Enterprises, LLC Expandable belt and tread drum with varied curvature segments
US10421241B2 (en) * 2015-01-16 2019-09-24 Compagnie Generale Des Etablissements Michelin Drum for producing a tire blank
US11358356B2 (en) 2018-09-27 2022-06-14 Davian Enterprises, LLC Transfer ring with block and rail system
US11548251B2 (en) 2019-01-28 2023-01-10 Davian Enterprises, LLC Expandable belt and tread drum with reverse offset fingers
US12083761B2 (en) 2020-04-22 2024-09-10 Davian Enterprises, LLC Shoulder assembly for tire building machine
US12162234B2 (en) 2020-05-29 2024-12-10 Davian Enterprises, LLC Transfer ring shoe and transfer ring with reduced air entrapment features
US11993043B2 (en) 2020-12-03 2024-05-28 Davian Enterprises, LLC Expandable belt and tread drum with magnetic deck fixing

Also Published As

Publication number Publication date
LU63477A1 (enrdf_load_stackoverflow) 1971-11-15
FR2100246A5 (enrdf_load_stackoverflow) 1972-03-17
CA941276A (en) 1974-02-05
GB1303233A (enrdf_load_stackoverflow) 1973-01-17
ES391772A1 (es) 1973-07-01
BE769536A (fr) 1971-11-16
SE375485B (enrdf_load_stackoverflow) 1975-04-21
DE2134567A1 (de) 1972-01-20
GB1303232A (enrdf_load_stackoverflow) 1973-01-17
JPS553133B1 (enrdf_load_stackoverflow) 1980-01-23
SE7408581L (enrdf_load_stackoverflow) 1974-06-28
ZA713340B (en) 1972-01-26

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