US3707220A - Modular passenger conveyor construction - Google Patents

Modular passenger conveyor construction Download PDF

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Publication number
US3707220A
US3707220A US91846A US3707220DA US3707220A US 3707220 A US3707220 A US 3707220A US 91846 A US91846 A US 91846A US 3707220D A US3707220D A US 3707220DA US 3707220 A US3707220 A US 3707220A
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Prior art keywords
modules
terminal
standard
conveyor
endless belt
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US91846A
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English (en)
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Henry Boltrek
Joseph K Kraft
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Westinghouse Electric Corp
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Westinghouse Electric Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B23/00—Component parts of escalators or moving walkways
    • B66B23/02—Driving gear
    • B66B23/028—Driving gear with separate drive chain or belt that engages directly the carrying surface chain
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B23/00—Component parts of escalators or moving walkways
    • B66B23/02—Driving gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B23/00—Component parts of escalators or moving walkways
    • B66B23/02—Driving gear
    • B66B23/04—Driving gear for handrails

Definitions

  • This invention relates to the construction of conveyors especially passenger conveyors of the moving stairway or moving walk variety.
  • radius of curvature for a moving stairway with an 8 foot rise may be in the neighborhood of 80 inches
  • this radius of curvature for a moving stairway designed to transport a load over an 80 foot rise may be in the neighborhood of 400 inches.
  • the supporting structure of apassenger conveyor is assembled from a number of standard modules regardless of the length or rise of the conveyor.
  • Standardized modular drive units are inserted inselected modules tomeet the requirements of the installation.
  • these drive units engage both the upper and lower runs of the conveyor and also preferably a drive unit is located just below the curvature from the inclined to the horizontal portion at the upper end of an. inclined conveyor. Since standard modules are used, the radius of curvature between the horizontal and inclined portions may be kept constant.
  • One module may be made variable in length in order to accommodate to the specifications of any installation.
  • the modular drive units can be inserted in any number of modules.
  • the modules are fabricated with all of the critical components aligned with respect to the tracks so that when the modules are joined together in the field, no track alignment is required.
  • the modules are welded together.
  • the tracks are made no longer than the truss and are provided with couplings by which tracks which are short because of manufacturing tolerances can be stretched to close the gap and facilitate an exact fit between the tracks of adjacent modules.
  • the modular drive units are constructed for easy installation and removal. They fit inside the loop of the conveyor endless belt and therefore can be located anywhere along the run.
  • the driving units are mounted on a frame which includes sections of track.
  • the driving elements are precisely aligned with respect to the track sections so that when the unit is installed in the module where it is supported through the track sections, the driving elements will be in precise alignment i new na-m BRIEF DESCRlPTlON OF THE DRAWINGS-
  • FIG. 1 is a schematic elevation view of a moving stairway embodying the invention
  • FIG. 1a is aschematic elevation view ofanother moving stiarway according to the invention
  • FIG. 7 is a diagram comparing roller loading on a conventional stairway with that on a stairway according to theinvention
  • FIG. 8 is a side elevation view of a standard intermediate module according to the invention.
  • FIG. 9 is an end elevation view of the module of FIG.
  • FIG. 1 illustrates a moving stairway which includes an upper terminal module 1, a lower terminal module 3 and two intermediate modules and 7.
  • the modules support an endless belt 9 which is composed of a series of steps 11 pivotally connected on modifications be made on the lower terminal module 3.
  • the dimension a of the lower terminal module-3 is made to the appropriate length to accommodate the requirements of the particular installation.
  • the length of the section a is variable up'to thev full length of an intermediate module thereby providing a full range of adjustment. 'It can be seen thenthat as many intermediate modules as is necessary may be coupled together to form the supporting structure for a stairway with any odd portion of the module taken up by the variable section a of the lower terminal module,
  • any number of modules may be coupled together to achieve a desired rise. Since the modular drive units can be inserted at any of the modules, the loading at any point along the stairway can be kept within acceptable low limits.
  • the length of the intermediate modules has been set at approximately 20 feet. Since the standard angle of incline on a moving stairway is each intermediate module adds 10 feet to the rise. lt has been determined that it is desirable to have a modular drive unit for each 20 feet of, rise, therefore it either side by racks in the form of toothed links 13.
  • the steps are guided and supported in their endless path by main wheels 15 and trailer wheels 17 which cooperate with main tracks 19 and trailer wheel tracks 21 carried by the modules.
  • the main tracks and the trailer tracks support the steps on both the load bearing upper run and return run with the steps in stepped relationship to one another on the inclined portions of the run and in platform relationship to one another on the horizontal portions of the run at the upper and lower terminals as is well known in the moving stairway art.
  • Modular drive units 23 engage the toothed links 13 to drive the steps about their endlesspathQl-landrails 25 on either side of the stepsare driven by a handrail drive units 27 which are part of the modular drive units 23.
  • the drive units 23 are show-n in the upper terminal module 1 and the intermediate module 7, it should be understood that such units can be provided for any of the modules.
  • the critical components in the supporting structure for the steps of a moving stairway are the tracks which guide the steps about their endless paths.
  • the conventional approach has been to construct the truss first and then insert the rails afterwards allowing for adjustment of the tracks to accommodate for manufacturing tolerances.
  • the tracks are first precisely aligned with respect to each other and then the truss is built around the tracks with all of the components aligned with respect to the tracks.
  • FIG. 2 is an isometric view of a standard intermediate module with a drive unit while FIGS. 8 and 9 are side and end elevation views of such a module without a drive unit.
  • Construction of the modules begins with the fabrication of right and left half-sections. For each half section, upper and'lower channel shaped main tracks 19 and upper and lower angle shaped trailer tracks 21 are precisely aligned with respect to each other through rigid connection to precision templates 29 provided at spaced intervals on the order of 22% inches in the preferred embodiment.
  • the four track sections held in rigid alignment by the templates form track assemblies.
  • the templates 29 are provided with aligning holes 31 by which the templates are assemblies. Machining of the templates 29 assures the I accurate alignment of the tracks.
  • the tracks arerigidly joined to the templates through the use of techniques known in the art of precision welding.
  • the half sections are completed by welding the loose pieces of the truss to thetrack assemblies.
  • Vertical truss members 33 are weldedto alternate templates 29. Upper longitudinal truss members 35 and lower longitudinal truss members 37 are then welded to the ends of the vertical truss members 33. Added rigidity is given to thestructure by diagonal truss members-39 which are welded to the upper longitudinal truss members 35 and the lower longitudinal truss members'37. All of the truss members mentioned to this point may be angles. If the module is to be used in an installation with opaque balustrades, the vertical truss members 33 are on the order of 5 feet in height as shown and'topped with deck brackets 41 which support the decking and upper run of the handrail. If the module is to be used with a transparent balustrade, the vertical truss members 33 may be on the order of 42 inches in height.
  • the right and lefthalf sections are then joined by boxing members 43 welded to corresponding alternate templates.
  • the track sections of the two half sections are precisely aligned with respect to each other by precision holes in the boxing members 43 which must be aligned with the precision holes 31 in the templates before welding.
  • Added rigidity is given to the module by transverse channel members 45 welded to the lower longitudinal truss members 37 and a diagonal truss member 47.
  • Coupling blocks 49 are welded to the ends of the tracks and to the four corners at each end of the truss.
  • the coupling blocks 49 are provided with holes parallel to the longitudinal axis of the module through which a bolt is passed to clamp the coupling block to asimilar coupling block on the correspondingcomponent of the adjacent module.
  • the coupling blocks on the truss members are provided with three holes so that the truss members may be joined by three bolts in each corner. All of the coupling blocks 49 are precisely aligned with respect to the track members so that no adjustments are required when the modules are coupled together in the field.
  • the steps are guided laterally by rollers mounted on the toothed links 13 as described in the copending application W.E. Case No. 41,814 mentioned above.
  • the step guide angles 51 are supported on the return run by vertical angles 53 welded to the lower longitudinal truss member 37 and horizontal angles 55.
  • On the upper run the step guide angle 51 is supported by the handrail return bracket 57.
  • the handrail return bracket 57 also supports the handrail return guide 59.
  • FIG. 2 also illustrates how a modular drive unit 23 is inserted in the modules.
  • the modular drive unit has a frame 61 which incorporates sections of the channel shaped main tracks 19.
  • the unit includes a drive motor 63 which operates through a gear reducer 65 to transmit power to drive couplings 67 which straddle the drive motor and gear reducer.
  • Each of the drive couplings 67 include a driving element in the form of a triple stranded chain which is supported in a loop by a pair of driven sprocket wheels and idler sprocket wheels which engage the outer strands of the triple stranded driving chain and lift the center strand of the chain into engagement with the toothed links 13 on either side of the stairway.
  • the track members 33 at the lower end of the module are farther apart than the other vertical truss members to'accommoclate for the modular drive unit.
  • the track members are cut short to receive the drive unit.
  • the track sections are extended and an additional template 29 is provided to give the track assembly rigidity.
  • the track sections are offset approximately 4 inches from the ends of the truss sections with the upper ends extending beyond the end of the truss as shown in FIG. 2.
  • the track sections are cut approximately 4 inches short of the end of the truss on the,
  • the cantilevered sections of the track allow for some flexibility in aligning the tracks of adjacent modules.
  • All of the track members are cut to +0, 1/32 inch tolerances in length. In'this manner the track sections 'are never too long and the coupling bolts can easily stretch the tracks to take up the maximum one-sixteenth inch of manufacturing tolerance.
  • FIG. 3 illustrates a section through a lower terminal module wherein the steps are guided from their inclined path to a horizontal path and then reversed in direction.
  • the inclined portion of the lower terminal module is similar in construction to the intermediate modules just described.
  • the main tracks 19and trailer tracks 21 extend approximately 4 inches beyond the end of the inclined portions a'ndare provided with coupling blocks 49 for joining the tracks in the lower module with those of the adjacent module.
  • the dimension a of the lower terminal module may be varied over the full length of one of the intermediate modules. As this dimension is reduced, it can be appreciated that vertical truss members 33 and diagonal truss members 39 may be eliminated as the tracks and the longitudinal truss members 35 and 37 are shortened.
  • pairs of angles forming channels are substituted for the single angle and the channel members used forthe trailer tracks and main tracks respectively on the straight portions of the run. These angles are more easily conformed to the desired curvature than channel members.
  • templates 29 similar to those used on the intermediate modules maintain the tracks in proper alignment.
  • the main tracks and trailer tracks must diverge so that the steps may transition from step to platform relation to one another. in this area another arrangement is utilized as can be seen by reference to FIG. 4 which is a sectional view taken along the lines lV-lV. in FIG. 3.'An angle 75 supporting the upper and lower portions of the mainjtrack is welded to a template 29. Similarly a second-shorter angle 77 supporting the upper and lower runs of the trailer track 21 .is also welded to the template 29.' A
  • vertical truss member 33 is welded to and supports the template 29'.
  • a boxing member 43 aligns and fixes the position of the tracks 19 and 21 with respect to the corresponding tracks on the other minal module.
  • the turn-around 79 for the lower terminal module includes the idler turn-around hoop 81 and the main wheel turn-around hoop 83 which are both connected to a plate 85 which is horizontally slidable with respect to the truss.-Fingers 87 on the ends of the turn-around hoop mesh with fingers 89 on the stationary tracks to provide a continuous guiding surface over an appreciable range of adjustment of the turn-around. It is well known that adjustment of the turn-around on a moving stairway is required to adapt the exact length of the endless path to the discrete number of steps in a particular stairway. Since the steps are 16 inches inlength, the endless path must be adjustable over this range.
  • Half of the adjustment can be taken up at the lower end and the other half at the upper end or the entire adjustment-may be taken at one end of the stairway.
  • FIG. illustrates the construction of an upper terminal module.
  • the horizontal and curved portions of this module are very similar to the corresponding portions of the lower terminal module.
  • the main tracks 19 and trailer tracks 21 are composed of pairsof angles in this area as they diverge to cause the steps to transition from the step to the platform relationship as they approach the upper turn-around.
  • the upper turn-around 79 is similar to the lower turn-around and is provided with fingers 87 which cooperate with the fingers 89 on the fixed tracks so that an adjustment in the length of the endless paths may be made while maintaining a continuous guiding surface for the step wheels.
  • the tracks are not provided in the lower section of the upper terminal-module so that a drive unit with the main.
  • wheel tracks incorporated into it may be dropped into place and coupled to the main wheel tracks 19 in the upper section and to the main wheel tracks in the adjacent intermediate module in the same manner in which it was described in detail for the intermediate modules.
  • individual. sections of the trailer tracks 21 must be inserted below and above the drive 'unit separately to complete those portions of the trailer tracks.
  • the track radius at the top curve must be increased. As seen in FIG. 7, the track radius for the l 10 foot rise must be 400 inches. Even with no load on the steps a force of approximately 240 pounds is exerted on the step wheels just due to the weight of the steps on the incline.
  • the components of the modular drive unit are relatively light and can be easily replaced.
  • the heaviest component is the gear reducer which weighs approximately 200 pounds, while the conventional machine for a 1 10 foot rise weighs approximately 20,000 pounds.
  • the interchangeability of parts obviously simplifies maintenance and the training of maintenance personnel. I
  • the modular stairway can be provided in either of the standard 32 or 48 inch step width sizes.
  • a passenger conveyor system for transporting passengers from one terminal to'another including an articulated endless belt comprising a series of pivotally connected rigid units, support means for supporting V and guiding said endless belt along an upper load bearing run and a lower return run, said support means Comprising a plurality of standard modules including serted in the upper terminal module near the transition between the inclined and horizontal paths and coupled to the upper and lower runs of said endless belt for driving said belt in its endless path, whereby any number of I modules some with and some without drive units can be assembled to meet the requirements of a particular .installation.
  • said support means includes at least one intermediate module and including a second drive unit, interchangeable with the first, inserted in one of the intermediate modules said second drive unit being coupled to the upper and lower runs of the endless belt for assisting the first drive unit in driving said belt about its endless path.
  • the passenger conveyor of claim 1 including at least one intermediate module, wherein one of said modules includes a variable length section for providing a continuous selection of lengths for the assembled supporting structure.
  • one of the terminal modules is provided with a variable length section, said variable length section being continuously variable up to the full length of an intermediate module.
  • a passenger conveyor system for transporting passengers from one terminal to another including an articulated endless belt comprising a series of pivotally connected rigid units, support means for supporting and guiding said endless belt along an upper load hearing run and a lower return run, said support means comprising a plurality of standard modules including two terminal modules and a plurality of straight intermediate modules, said terminal modules being horizontally and vertically separated so that at least a portion of the path traversed by said endless belt is inclined, said terminal modules supporting the endless belt on a portion of the inclined path and a horizontal path as the belt approaches the ends of the runs, and interchangeable drive units supported by selected ones of said intermediate modules said drive units being coupled to both the upper and lower runs of said endless belt for driving said belt in its endless path, whereby any number of modules some with and some without drive units can be assembled to meet the requirements of a particular installation.
  • a passenger conveyor comprising an endless belt
  • each of said modules including right and lefthalf sections, said half sections comprising upper and lower track members for guiding and supporting the endless belt through the edge.
  • coupling members include coupling means rigidly connected to-the track members and precisely aligned with the ends of the track members for directly coupling the corresponding track members of adjacent modules.
  • the passenger conveyor of claim 6 including a modular drive unit having a driving element for engaging and driving said endless belt and mounting means for mounting said modular drive unit in a selected module with the driving element in precise predetermined alignment with respect to said track members.
  • said mounting means comprises a frame for supporting the drive unit, said frame including a section of track member and coupling means for coupling the section of track member in precise longitudinal alignment with a track member of the module to form a portion of the guide for the edge mounted rollers.
  • said frame includes upper and lower sections of track members and coupling means for coupling said upper and lower sections of track members to the corresponding track members in the module with the track sections in precise longitudinal alignment with the corresponding track members of the module.
  • each ofsaid conveyors comprising an endless belt having upper and lower runs, support means and drive means, said 'sup'port means including standard upper and lower terminal modules and'standard intermediate modules with thesupport means for said first conveyor comprising at least said standard upper and standard lower modules,'and.
  • each of said conveyors comprising an endless belt, support means and drive means, said support means including standard upper and lower terminal modules and standard intermediate modules with the support means for said first conveyor comprising at least said standard upper and standard lower modules, and with said support'means for said second conveyor comprising in addition to said standard upper and standard lower modules a plurality of standard intermediate modules, an adjustable length module, one of said conveyors including, in addition to the standard upper, lower and intermediate modules, said adjustable length module, said standard terminal modules guiding said endless belts from an inclined to a horizontal path about a curved path having a predetermined fixed radius of curvature as the endless belt approaches the end of its run, said fixed radius of curvature being independent of the number of modules in the conveyor, said drive means comprising standard modular drive units which may be

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  • Escalators And Moving Walkways (AREA)
  • Chain Conveyers (AREA)
US91846A 1970-11-23 1970-11-23 Modular passenger conveyor construction Expired - Lifetime US3707220A (en)

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US9184670A 1970-11-23 1970-11-23

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US (1) US3707220A (enrdf_load_stackoverflow)
JP (1) JPS5149114B2 (enrdf_load_stackoverflow)
BE (1) BE775634A (enrdf_load_stackoverflow)
BR (1) BR7107239D0 (enrdf_load_stackoverflow)
CA (1) CA953236A (enrdf_load_stackoverflow)
DE (1) DE2157423A1 (enrdf_load_stackoverflow)
FR (1) FR2115856A5 (enrdf_load_stackoverflow)
GB (1) GB1336360A (enrdf_load_stackoverflow)
IT (1) IT940777B (enrdf_load_stackoverflow)
NL (1) NL7116029A (enrdf_load_stackoverflow)

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US4227605A (en) * 1975-09-17 1980-10-14 O & K Orenstein & Koppel Aktiengesellschaft Driving unit for escalators for driving the step band
US4232783A (en) * 1979-03-19 1980-11-11 Westinghouse Electric Corp. Step link for transportation apparatus
US4260318A (en) * 1979-08-08 1981-04-07 Westinghouse Electric Corp. Installation apparatus for escalators
EP0054687A1 (de) * 1980-12-23 1982-06-30 Inventio Ag Führungseinrichtung für die Laufelelemente von Endlosförderern wie Fahrtreppen und dergleichen
FR2552061A1 (fr) * 1983-09-15 1985-03-22 Westinghouse Electric Corp Escalier roulant ayant notamment une ou plusieurs unites d'entrainement
US4589539A (en) * 1983-09-15 1986-05-20 Westinghouse Electric Corp. Transportation apparatus having a moving handrail
US4600865A (en) * 1984-10-29 1986-07-15 Westinghouse Electric Corp. Transportation apparatus
US4726460A (en) * 1983-11-11 1988-02-23 Mitsubishi Denki Kabushiki Kaisha Frame structure for a curved escalator
US4738346A (en) * 1985-10-29 1988-04-19 Mitsubishi Denki Kabushiki Kaisha Driving unit for passenger conveyor system
US4832169A (en) * 1981-12-21 1989-05-23 Mitsubishi Denki Kabushiki Kaisha Framework structure for an inclined passenger conveyor such as an escalator
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USD327558S (en) 1989-03-17 1992-06-30 Inventio Ag Set of end units for balustrades
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EP0866019A1 (de) * 1997-03-17 1998-09-23 Inventio Ag Fahrtreppe oder Fahrsteig mit Unterspannung
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US6342768B1 (en) * 1998-12-23 2002-01-29 Thyssen De Reus B.V. Displacement apparatus arranged for guiding a carrying device along at least two rails
US20050108974A1 (en) * 2003-11-21 2005-05-26 Richard Lauch Escalator solid side truss construction
DE102004001519A1 (de) * 2004-01-10 2005-08-04 Kone Corp. Modernisierte Rolltreppe oder modernisierter Rollsteig
DE102004001517A1 (de) * 2004-01-10 2005-08-04 Kone Corp. Modernisierte Rolltreppe oder modernisierter Rollsteig
EP2394946A1 (en) * 2010-06-11 2011-12-14 ThyssenKrupp Elevator Innovation Center S.A. Drive mechanism for drive chains of mechanical stairways and moving walkways
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US20150375967A1 (en) * 2013-03-21 2015-12-31 China University Of Mining And Technology Long-distance transport system for people in inclined lane
DE102015224549A1 (de) * 2015-12-08 2017-06-08 Thyssenkrupp Ag Fahrtreppen- oder Fahrsteigtragekonstruktion sowie Verfahren zur Fertigung zumindest eines Teilsegments einer Fahrtreppen- oder Fahrsteigtragekonstruktion
EP3392190A1 (en) * 2011-05-25 2018-10-24 ThyssenKrupp Norte, S.A. Support, module, transport system for displacement of people/goods and modernization method of people/goods transport systems
US10150650B2 (en) * 2015-09-29 2018-12-11 Inventio Ag Method for installing a support structure for a passenger transport system in a construction
DE102018213647A1 (de) * 2018-08-14 2019-08-01 Thyssenkrupp Ag Führungsschienenhaltesystem für eine Fahrtreppe
CN113772522A (zh) * 2021-09-29 2021-12-10 苏州汉森电梯有限公司 一种嵌入式合成型自动扶梯
WO2022147540A1 (en) * 2021-01-04 2022-07-07 Beltways Inc. Systems and methods for variable speed modular moving walkways
US20230416056A1 (en) * 2020-12-21 2023-12-28 Inventio Ag Rail fastening device for guide rail sections of an escalator or moving walkway

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JPS55115585A (en) * 1979-02-28 1980-09-05 Mitsubishi Electric Corp Stop controller for passenger conveyor
JPS5711160A (en) * 1980-06-26 1982-01-20 Mitsubishi Electric Corp Driving device for parapet
JPS5713561U (enrdf_load_stackoverflow) * 1980-06-26 1982-01-23
JPS59190779U (ja) * 1984-04-11 1984-12-18 株式会社日立製作所 乗客コンベアの移動てすり駆動装置
JP2513847B2 (ja) * 1989-07-14 1996-07-03 株式会社日立ビルシステムサービス 斜行エレベ―タのガイドレ―ル設置方法
WO2000055086A1 (fr) * 1999-03-12 2000-09-21 Hitachi, Ltd. Ensemble escalier roulant
WO2000058196A1 (fr) * 1999-03-26 2000-10-05 Hitachi, Ltd. Escalier roulant
JP4961464B2 (ja) * 2009-09-30 2012-06-27 株式会社日立製作所 乗客コンベア
ES2900448T3 (es) 2015-06-25 2022-03-17 Tk Elevator Innovation Center S A Cercha modular para escaleras mecánicas/pasillos rodantes y procedimiento de ensamblaje de una cercha modular para escaleras mecánicas/pasillos rodantes
JP6266698B2 (ja) * 2016-06-14 2018-01-24 東芝エレベータ株式会社 乗客コンベアのトラスの組み立て方法
WO2021205544A1 (ja) * 2020-04-07 2021-10-14 三菱電機株式会社 乗客コンベアのトラス構造

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FR1412164A (fr) * 1963-11-19 1965-09-24 Transporteur pour personnes ou marchandises à surfaces porteuses sans fin, reliéesentre elles par un moyen de liaison, en particulier escalier roulant

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US2005067A (en) * 1933-07-10 1935-06-18 Otis Elevator Co Moving stairway
US3478865A (en) * 1968-05-24 1969-11-18 Clifford Vogel Apparatus for the harvesting of tobacco

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227605A (en) * 1975-09-17 1980-10-14 O & K Orenstein & Koppel Aktiengesellschaft Driving unit for escalators for driving the step band
US4232783A (en) * 1979-03-19 1980-11-11 Westinghouse Electric Corp. Step link for transportation apparatus
US4260318A (en) * 1979-08-08 1981-04-07 Westinghouse Electric Corp. Installation apparatus for escalators
EP0054687A1 (de) * 1980-12-23 1982-06-30 Inventio Ag Führungseinrichtung für die Laufelelemente von Endlosförderern wie Fahrtreppen und dergleichen
US4484674A (en) * 1980-12-23 1984-11-27 Inventio Ag Guiding apparatus for the travel elements of endless conveyors, such as escalators and the like
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JPS4710873A (enrdf_load_stackoverflow) 1972-05-31
NL7116029A (enrdf_load_stackoverflow) 1972-05-25
CA953236A (en) 1974-08-20
IT940777B (it) 1973-02-20
GB1336360A (en) 1973-11-07
BR7107239D0 (pt) 1973-04-17
JPS5149114B2 (enrdf_load_stackoverflow) 1976-12-24
BE775634A (fr) 1972-05-23
FR2115856A5 (enrdf_load_stackoverflow) 1972-07-07
DE2157423A1 (de) 1972-05-31

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