US3603099A - Process of making intraground waterproof baffles and a device therefor - Google Patents

Process of making intraground waterproof baffles and a device therefor Download PDF

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Publication number
US3603099A
US3603099A US791472*A US3603099DA US3603099A US 3603099 A US3603099 A US 3603099A US 3603099D A US3603099D A US 3603099DA US 3603099 A US3603099 A US 3603099A
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US
United States
Prior art keywords
trench
foil
roll
head
along
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
US791472*A
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English (en)
Inventor
Bohdan Zakiewicz
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.)
PRZED SPECJALISTYCZNE GORNICTW
PRZEDSIEBIORSTWO SPECJALISTYCZNE GORNICTWA SUROWCOW CHEMICZNYCH
Original Assignee
PRZED SPECJALISTYCZNE GORNICTW
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
Priority claimed from PL124819A external-priority patent/PL65062B1/pl
Application filed by PRZED SPECJALISTYCZNE GORNICTW filed Critical PRZED SPECJALISTYCZNE GORNICTW
Application granted granted Critical
Publication of US3603099A publication Critical patent/US3603099A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
    • E02F5/06—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with digging elements mounted on an endless chain
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/06—Foundation trenches ditches or narrow shafts
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/13—Foundation slots or slits; Implements for making these slots or slits
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/16—Restraining of underground water by damming or interrupting the passage of underground water by placing or applying sealing substances
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/18—Bulkheads or similar walls made solely of concrete in situ
    • E02D5/187—Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/08—Dredgers; Soil-shifting machines mechanically-driven with digging elements on an endless chain
    • E02F3/10—Dredgers; Soil-shifting machines mechanically-driven with digging elements on an endless chain with tools that only loosen the material, i.e. with cutter-type chains
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
    • E02F5/12—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with equipment for back-filling trenches or ditches

Definitions

  • the invention comprises a process and a device therefor, for making intraground waterproof baffles or barriers, provided with one or more strips of thin, flexible insulating material inserted therein as are widely used in hydraulic engineering in order to prevent infiltration of water into protected areas.
  • Such intraground waterproof baffles with inserted strips of thin insulating material which prevent infiltration of water into the protected areas, are made of one or more layers of an insulating material introduced as a curtain into a cut previously excavated in the subsurface. The introduction of the insulating material is carried out apart from the device for excavating the cut.
  • the materials mostly used for this purpose are: asphalt-impregnated jute; vinyl, rubber or plastic, e.g. polyethylene, foil; thins asphalt-impregnated fiberboard; paper; waterproof cloth and the like.
  • the insulating materials are introduced into the cut in form of vertical sections, being dropped into place in the form of a curtain.
  • the sections are provided with kentledges or ballast weights.
  • the device for performing this operation has a horizontally positioned drum with a thin, insulating material reeled thereon.
  • the drum is mounted on a separate support, located above the cut and shifted independently from the excavating device.
  • the kentledges attached to the edge of each segment enable unreeling of a thin insulating material and inserting it into the excavated cut.
  • the present invention has as its object to save operating costs and to simplify the process of making intraground waterproof baffles. Another object is to reduce the time consumed in producing such baffles and to improve their scaling properties.
  • the process according to the invention comprises introducing a thin, flexible insulating material into the cut simultaneously with shifting the excavating machine, whereas the space between vertical walls of the cut and an insulating material is filled with a suitable material in known manner.
  • FIG. 1 is a vertical section
  • FIG. 2 is a horizontal section through the apparatus.
  • the device comprises a cutter bar 2 provided at its bottom part with a hinged connector 3, a sheet guard 4 mounted therein, and with apron flashings 5 protecting against penetration of a suspension within the guard 4 and against infiltration of a filling material from trench section 6 to section 7.
  • the drum 8 carrying a thrn flexible insulating material 9 reeled thereon is mounted within the guard.
  • An insulating material is fastened at one edge to a tubular post 10 being fixed in the bottom of the cut especially for this purpose and counterbalanced at its upper lid by means of tension members and anchors 11.
  • the downward pressure of the cutter bar is controlled by means of a hydraulic mechanism or screw gear 13 and the cutter chain is driven by the driving motor 14.
  • the drum shaft is mounted in movable bearings 12.
  • the shift direction of the device is marked by number 15.
  • a thin flexible insulating material unreels along the cut progressively in the course of shifting the excavating machine which creates the trench 6, 7.
  • the tubular post is drawn out from the bottom of the cut.
  • An apparatus for producing fluid-impermeable underground barriers comprising a bucket-type trench-excavating head displaceable along an excavation line to cut a trench in the ground; means for displacing said head along said line; support means for a roll of flexible waterproof foils coupled with said head and having an upright axis for paying out said foil in an upright sheet progressively with displacement of said head whereby said foil is positioned in the trench cut by said head between the walls thereof, and subsequent filling of the gap between said foil and said wall supports said foil, said head being provided with a hinged connection extending rearwardly of the direction of displacement of said head along said line and carrying said support; and a sheet guard ahead of said roll and a pair of aprons extending rearwardly from said sheet guard toward said walls of said trenchfor sealing the portion of the trench ahead of said roll from the portion of the trench behind said roll, said foil being laid in said portion of said trench behind said foil.
  • a method of forming a fluid-impenetrable subsurface barrier comprising the steps of: continuously excavating a trench along an excavation line in the presence of a solid-inliquid suspension; progressively with the excavation of said trench, displacing a roll of a flexible waterproof foil along said trench with said roll positioned for rotation about an upright axis while laying said foil in said trench in an upright state; progressively shielding said roll in said foil from said suspension as said roll is advanced along said trench; and filling the space between said foil and the wall of said trench.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Paleontology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Mechanical Engineering (AREA)
  • Bulkheads Adapted To Foundation Construction (AREA)
  • Earth Drilling (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
US791472*A 1968-01-22 1969-01-15 Process of making intraground waterproof baffles and a device therefor Expired - Lifetime US3603099A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL124819A PL65062B1 (ro) 1968-01-22

Publications (1)

Publication Number Publication Date
US3603099A true US3603099A (en) 1971-09-07

Family

ID=19949851

Family Applications (2)

Application Number Title Priority Date Filing Date
US791472*A Expired - Lifetime US3603099A (en) 1968-01-22 1969-01-15 Process of making intraground waterproof baffles and a device therefor
US791358*A Expired - Lifetime US3603097A (en) 1968-01-22 1969-01-15 Process of making underground structures for underdraining and shielding purposes

Family Applications After (1)

Application Number Title Priority Date Filing Date
US791358*A Expired - Lifetime US3603097A (en) 1968-01-22 1969-01-15 Process of making underground structures for underdraining and shielding purposes

Country Status (12)

Country Link
US (2) US3603099A (ro)
JP (1) JPS4832464B1 (ro)
AT (1) AT306650B (ro)
BE (3) BE727269A (ro)
CA (1) CA926140A (ro)
DD (1) DD99193A5 (ro)
DE (3) DE1902137A1 (ro)
FR (3) FR2000531A1 (ro)
GB (3) GB1247791A (ro)
NL (3) NL6900977A (ro)
RO (1) RO54806A (ro)
YU (2) YU13969A (ro)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3759044A (en) * 1970-06-16 1973-09-18 Soletanche Method of earth wall construction using cementitious bentonitic mud
US3864921A (en) * 1972-03-07 1975-02-11 Karl Marx Method and apparatus for lining the walls of excavations
US3968658A (en) * 1973-09-12 1976-07-13 Schlegel Engineering Gmbh Method and apparatus for introducing water-proof sheeting into the ground in a vertical position
EP0185418A1 (en) * 1984-11-29 1986-06-25 Hollandsche Beton Groep N.V. Method and device for the installation of a watertight shield in the soil
US4741644A (en) * 1985-04-11 1988-05-03 Finic, B.V. Environmental cut-off and drain
US4863312A (en) * 1983-07-26 1989-09-05 Finic, B. V. Underground leachate and pollutant drainage barrier system
US4877358A (en) * 1981-04-09 1989-10-31 Finic, B.V. Method and apparatus of constructing a novel underground impervious barrier
US5056242A (en) * 1989-05-12 1991-10-15 Finic, B.V. Underground wall construction method and apparatus
US5836390A (en) * 1995-11-07 1998-11-17 The Regents Of The University Of California Method for formation of subsurface barriers using viscous colloids
US20040234345A1 (en) * 2003-02-27 2004-11-25 Maximilian Arzberger Method for making a trench wall in the ground, trench wall cutter and trench wall cutting device
US20150375264A1 (en) * 2013-06-28 2015-12-31 Hung M & S Biochem Technology Co., Ltd. Waterproof Coating Process Machine and Its Negative Pressure Coating and Atomized Coating Methods
US20160047105A1 (en) * 2014-08-15 2016-02-18 Gww-Infra Holding B.V. Method and device for providing a piping protection system in a dike body
US10232292B2 (en) * 2014-06-13 2019-03-19 Van Den Herik Sliedrecht Method and apparatus for placement of a subterranean curtain below the face of the earth
US20190376257A1 (en) * 2017-01-18 2019-12-12 Yubin Wang Grooving Device for Underground Structures and Its Construction Method

Families Citing this family (30)

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US4028902A (en) * 1976-10-01 1977-06-14 Central Illinois Tile Co. Apparatus for laying elongated flexible tubing
FR2483485A1 (fr) * 1980-06-03 1981-12-04 Sif Entreprise Bachy Procede de realisation de tranchees drainantes et tranchees drainantes realisees par ce procede
DE3407382C2 (de) * 1984-02-29 1994-08-04 Zueblin Ag Verfahren zur Fertigung einer etwa waagrechten Dichtungsschicht und Vorrichtung zur Durchführung des Verfahrens
USRE34576E (en) * 1984-03-13 1994-04-05 S.W.R. (Australia) Pty., Limited Casting of structural walls
DE3582590D1 (de) * 1984-03-13 1991-05-23 Foundation Technology Aust Pty Giessen struktureller waende.
GB8411591D0 (en) * 1984-05-05 1984-06-13 Davison G W Pipe-laying apparatus
DE3419163A1 (de) * 1984-05-23 1985-11-28 Ed. Züblin AG, 7000 Stuttgart Verfahren und vorrichtung zur abdichtung gegen deponie-sickerwasser
FR2573475B1 (fr) * 1984-11-16 1987-10-16 Soletanche Nouveau procede pour l'exploitation de gisements de minerais
NL8500421A (nl) * 1985-02-14 1986-09-01 Digging Trading Werkwijze en inrichting voor het in de grond brengen van een scherm.
NL8502160A (nl) * 1985-07-30 1987-02-16 Hollandsche Betongroep Nv Werkwijze voor het vervaardigen van een scherm in de grond.
GB2179386B (en) * 1985-08-19 1989-04-19 Alexander Clive John Baker Inserting barrier material into the ground
FR2591247A1 (fr) * 1985-12-11 1987-06-12 Frankignoul Pieux Armes Procede et machine pour l'installation dans le sol d'un ou plusieurs elements formant ecran de grande dimension
EP0233369A1 (de) * 1986-01-13 1987-08-26 Alfred Dr. Hackmack Schlitzgerät für die Herstellung von Schlitzwänden und dergleichen und Schlitzwandherstellungsverfahren
US4843742A (en) * 1986-06-13 1989-07-04 Continuous Concrete Casting Pty. Limited Trenching apparatus and methods of forming inground retaining walls
DE3627872C2 (de) * 1986-08-16 1997-06-19 Zueblin Ag Mischvorrichtung zum Einbringen einer Dichtwandmasse in einen Dichtwandschlitz
DE8716630U1 (de) * 1987-12-17 1988-03-17 Berkemeyer, Ralf, 7822 Häusern Konstruktion zum Auffangen und Lagern von Schnee - Schneeschutzdach
DE3927933A1 (de) * 1989-08-24 1991-03-21 Dyckerhoff & Widmann Ag Verfahren zum herstellen einer dichtwand sowie vorrichtung zum durchfuehren des verfahrens
DE4008207A1 (de) * 1990-03-15 1990-08-23 Bilfinger Berger Bau Verfahren zur herstellung einer dichtwand
US5242246A (en) * 1992-02-18 1993-09-07 Terranalysis Corporation Surface remediator
GB9305993D0 (en) * 1993-03-23 1993-05-12 Burke Barry Trench liner
DE4413289C2 (de) * 1994-04-16 1998-03-12 Lobbe Xenex Gmbh & Co Bodenbearbeitungsgerät
AT26U3 (de) * 1994-07-28 1995-03-27 Freudenreich Gerhard Ing Freud Gleitverbau zur mechanisierten herstellung von kangleitverbau zur mechanisierten herstellung von kanälen älen
DE4440691A1 (de) * 1994-11-15 1996-06-27 Lausitzer Braunkohle Ag Verfahren und Einrichtung zum kontinuierlichen Herstellen unterirdischer vertikaler Schlitzwände, vorzugsweise zur Abdichtung von Deponien
US5701692A (en) * 1996-07-03 1997-12-30 Groundwater Control, Inc. Containment wall installation process and apparatus
US5988947A (en) * 1997-11-04 1999-11-23 Bruso; Bruce L. Multi-section soil remediation device
DE10252833B3 (de) * 2002-11-13 2004-07-15 Bauer Spezialtiefbau Gmbh Fräsvorrichtung und Verfahren zur Herstellung eines Schlitzes
AU2002952972A0 (en) * 2002-11-28 2002-12-12 Mitchell Australasia Pty Ltd Trench forming and preparing apparatus
FR2879632B1 (fr) * 2004-12-17 2007-04-20 Cie Du Sol Soc Civ Ile Procede de realisation de parois moulees
CN106759262A (zh) * 2017-01-19 2017-05-31 中建三局集团有限公司 地连墙连续锯割成槽同步灌注成墙装置及施工方法
US10731320B2 (en) 2018-12-06 2020-08-04 HHS Construction Inc. Slurry sled for filling trench holes

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Publication number Priority date Publication date Assignee Title
US2636288A (en) * 1947-01-31 1953-04-28 Thomas William Digging angle adjustment for endless belt excavators
US3298183A (en) * 1964-05-11 1967-01-17 Cons Thermoplastics Company Apparatus for erecting a fluid barrier
US3309875A (en) * 1963-07-05 1967-03-21 Niederwemmer Paul Irrigation installation and mobile vehicle for producing the same
US3327484A (en) * 1965-01-14 1967-06-27 Tooth H & L Co Tape laying plow

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US1270142A (en) * 1917-04-27 1918-06-18 Lorenzo R Gage Sr Gold-dredge.
NL25839C (ro) * 1927-03-08
US1731838A (en) * 1927-03-26 1929-10-15 Pettibone Mulliken Company Dredge and the like
US3201948A (en) * 1961-05-04 1965-08-24 Arthur G Schramm Trenching and cable laying machine
US3203188A (en) * 1961-10-23 1965-08-31 Jetco Inc Method and apparatus for preparing a trench for a subsurface conduit line and for laying such a line
US3332249A (en) * 1965-01-22 1967-07-25 Challenge Cook Bros Inc Trench digging and refilling apparatus
US3385068A (en) * 1966-11-14 1968-05-28 Arthur L. Armentrout Method of making trench dam

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636288A (en) * 1947-01-31 1953-04-28 Thomas William Digging angle adjustment for endless belt excavators
US3309875A (en) * 1963-07-05 1967-03-21 Niederwemmer Paul Irrigation installation and mobile vehicle for producing the same
US3298183A (en) * 1964-05-11 1967-01-17 Cons Thermoplastics Company Apparatus for erecting a fluid barrier
US3327484A (en) * 1965-01-14 1967-06-27 Tooth H & L Co Tape laying plow

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3759044A (en) * 1970-06-16 1973-09-18 Soletanche Method of earth wall construction using cementitious bentonitic mud
US3864921A (en) * 1972-03-07 1975-02-11 Karl Marx Method and apparatus for lining the walls of excavations
US3968658A (en) * 1973-09-12 1976-07-13 Schlegel Engineering Gmbh Method and apparatus for introducing water-proof sheeting into the ground in a vertical position
US4877358A (en) * 1981-04-09 1989-10-31 Finic, B.V. Method and apparatus of constructing a novel underground impervious barrier
US4863312A (en) * 1983-07-26 1989-09-05 Finic, B. V. Underground leachate and pollutant drainage barrier system
EP0185418A1 (en) * 1984-11-29 1986-06-25 Hollandsche Beton Groep N.V. Method and device for the installation of a watertight shield in the soil
US4741644A (en) * 1985-04-11 1988-05-03 Finic, B.V. Environmental cut-off and drain
US5056242A (en) * 1989-05-12 1991-10-15 Finic, B.V. Underground wall construction method and apparatus
US5836390A (en) * 1995-11-07 1998-11-17 The Regents Of The University Of California Method for formation of subsurface barriers using viscous colloids
US20040234345A1 (en) * 2003-02-27 2004-11-25 Maximilian Arzberger Method for making a trench wall in the ground, trench wall cutter and trench wall cutting device
US7152346B2 (en) 2003-02-27 2006-12-26 Bauer Maschinen Gmbh Method for making a trench wall in the ground, trench wall cutter and trench wall cutting device
US20070044347A1 (en) * 2003-02-27 2007-03-01 Maximilian Arzberger Method for making a trench wall in the ground, trench wall cutter, and trench wall cutting device
US7356947B2 (en) 2003-02-27 2008-04-15 Bauer Maschinen Gmbh Method for making a trench wall in the ground, trench wall cutter, and trench wall cutting device
US20150375264A1 (en) * 2013-06-28 2015-12-31 Hung M & S Biochem Technology Co., Ltd. Waterproof Coating Process Machine and Its Negative Pressure Coating and Atomized Coating Methods
US9399240B2 (en) * 2013-06-28 2016-07-26 Hung M & S Biochem Technology Co. Ltd. Waterproof coating process machine and its negative pressure coating and atomized coating methods
US10232292B2 (en) * 2014-06-13 2019-03-19 Van Den Herik Sliedrecht Method and apparatus for placement of a subterranean curtain below the face of the earth
US20160047105A1 (en) * 2014-08-15 2016-02-18 Gww-Infra Holding B.V. Method and device for providing a piping protection system in a dike body
US20190376257A1 (en) * 2017-01-18 2019-12-12 Yubin Wang Grooving Device for Underground Structures and Its Construction Method

Also Published As

Publication number Publication date
NL6900977A (ro) 1969-07-24
GB1247791A (en) 1971-09-29
DD99193A5 (ro) 1973-07-20
BE727269A (ro) 1969-07-01
AT306650B (de) 1973-04-25
NL6900978A (ro) 1969-07-24
BE727271A (ro) 1969-07-01
RO54806A (ro) 1973-07-20
GB1258428A (ro) 1971-12-30
YU13769A (en) 1973-08-31
FR2000531A1 (ro) 1969-09-12
DE1902324A1 (de) 1969-09-04
YU13969A (en) 1973-08-31
FR2000530A1 (ro) 1969-09-12
CA926140A (en) 1973-05-15
US3603097A (en) 1971-09-07
DE1902137A1 (de) 1969-10-02
NL6900976A (ro) 1969-07-24
JPS4832464B1 (ro) 1973-10-06
GB1250046A (en) 1971-10-20
BE727270A (ro) 1969-07-01
FR2000532A1 (ro) 1969-09-12
DE1902138A1 (de) 1969-08-28

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