US3922865A - Mattress, method of sinking a mattress and vessel suitable for use in said method - Google Patents

Mattress, method of sinking a mattress and vessel suitable for use in said method Download PDF

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Publication number
US3922865A
US3922865A US395575A US39557573A US3922865A US 3922865 A US3922865 A US 3922865A US 395575 A US395575 A US 395575A US 39557573 A US39557573 A US 39557573A US 3922865 A US3922865 A US 3922865A
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US
United States
Prior art keywords
mattress
vessel
bars
filter cloth
concrete blocks
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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
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US395575A
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English (en)
Inventor
Ate Nijdam
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.)
Aannemers Combinatie Zinkwerken BV
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Aannemers Combinatie Zinkwerken BV
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
    • B63B27/19—Other loading or unloading equipment involving an intermittent action, not provided in groups B63B27/04 - B63B27/18
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
    • E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
    • E02B3/121—Devices for applying linings on banks or the water bottom
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
    • E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
    • E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
    • E02B3/123—Flexible prefabricated covering elements, e.g. mats, strips mainly consisting of stone, concrete or similar stony material

Definitions

  • the invention relates to a mattress comprising ballast.
  • the invention has for its object to provide a mattress which can be effectively manufactured and sunk, whilst a satisfactory fixation of the ballast material is ensured.
  • the concrete blocks are rigidly secured to the filter cloth so that they cannot be loosened from said cloth by tidal currents or the like.
  • the spaces between the concrete blocks can be filled with ballast for example, gravel, stone and/or rubble, which ballast will be satisfactorily enclosed between the concrete block so that even on comparatively sharply inclined surfaces to be protected rolling away of the ballast material is avoided.
  • an effective method of sinking such a mattress is obtained by anchoring the mattress by one end to the ground, which end is sunk from a vessel to the ground, the mattress being deposited on the ground during the movement of the vessel in a direction away from the anchorage of the mattress. In this way the mattress can be gradually lowered to the ground and deposited thereon in a stretched state.
  • Sinking of the mattress can be carried out in a particular effective manner with the aid of a vessel comprising, in the direction of displacement of the mattress across the vessel, two grabs arranged one after the other, which can be coupled with the mattress and which are adapted to reciprocate with a given phase difference for controllling the movement of the mattress. It can thus be avoided that the mattress slips off the vessel too rapidly under the action of its own weight, in which case it would be incorrectly deposited on the ground.
  • FIG. 1 is a schematic longitudinal sectional view of a mattress embodying the invention.
  • FIG. 2 is a schematic cross sectional view of a mattress embodying the invention.
  • FIG. 3 shows on an enlarged scale a first form of connection between the filter cloth and a concrete block.
  • FIG. 4 is a cross sectional view of the connection of F IG. 3.
  • FIG. 5 shows schematically a second embodiment of a connection between the filter cloth and a concrete block.
  • FIG. 6 is a sectional view of the connection of FIG.
  • FIG. 7 shows schematically a third embodiment of the connection between the filter cloth and a concrete block.
  • FIG. 8 is a side elevation of the connection of FIG. 7.
  • FIG. 9 is a plan view of the connection of FIG. 7.
  • FIG. 10 shows schematically one embodiment of a vessel for depositing a mattress, the mattress being loaded thereon, when sinking of the mattress starts.
  • FIG. 11 shows the vessel of FIG. 10 with the mattress in a further stage of sinking.
  • FIG. 12 shows the vessel of FIG. 10 with the mattress after the termination of the sinking operation.
  • FIG. 13 shows on an enlarged scale part of the vessel with the grabs arranged thereon.
  • FIGS. 14 to 17 show schematically a vessel with a reel coupled herewith for transporting the mattress.
  • FIG. 18 shows a further embodiment of a mattress.
  • a mattress embodying the invention comprises a filter cloth 1, on which, viewed in the direction of length of the cloth, a plurality of rows of concrete blocks 2 are arranged one after the other.
  • FIG. 2 shows that in the direction of width of the filter cloth a plurality of blocks of comparatively short length, for example a length of about cms, having intervals of 25 cms are connected with the cloth instead of connecting a beam extending over the whole width of the cloth, so that the mattress can more satisfactorily match the unevennesses of the ground.
  • the concrete blocks preferably have a square section having a width and a height of about 45 cms. As a mat ter of course, other suitable dimensions may be chosen.
  • connection between a concrete block and a filter cloth may be established in various ways.
  • a metal bar 3 for example, of armouring iron, is woven in the cloth anchoring members formed by T-sections 4 being welded to the bar 3.
  • the cloth is spread and casings are placed on the cloth for casting the concrete to form the concrete blocks 2. It is ensured that in each concrete block at least on two parallel bars anchoring members 4 are embedded as is illustrated in FIG. 4.
  • the distance between two concrete blocks located one behind the other in the direction of length of the filter cloth is preferably about cms.
  • FIGS. 5 and 6 A second form of connecting concrete blocks 2 with the filter cloth 1 is shown schematically in FIGS. 5 and 6.
  • only straight metal bars 5, for example, of armouring iron, are woven in the filter cloth.
  • At least substantially V-shaped anchoring members are pierced through the filter cloth so that the interwoven bars 3 are located in the bend between the two limbs of the V-shaped anchoring members. (FIG. 6).
  • the ends of the limbs of the anchoring members may be bent over as is shown in FIG. 6. Also in this case it is ensured, when the bars are woven in, that two bars are comparatively near each other so that the anchoring members slipped around two bars will be embedded in a concrete block 2.
  • FIGS. 7 to 9 A third method of connecting a concrete block with the filter cloth is illustrated in FIGS. 7 to 9.
  • the filter cloth is provided with metal bars 7, for example, of armouring iron, the ends of the bars being bent upwardly at right angles and being curled to form eyelets 8.
  • a prefabricated concrete block 2 can be coupled with the filter cloth 1.
  • the distance between two bars located one behind the other viewed in the direction of length of the filter cloth is chosen to be equal to the width of a concrete block 2.
  • cavities are provided so that these cavities get in line with the eyelets 8.
  • FIGS. 7 to 9 show furthermore that on each side of a concrete block preferably two aligned bars 7 provided with eyelets 8 are woven in the filter cloth 1 so that each concrete block can be connected by four bolts 9 with the filter cloth.
  • a rush-mat is deposited on the filter cloth, said mat also being rigidly secured to the filter cloth after the concrete blocks are fastened.
  • the use of such rush-mat may be useful to avoid damage-of the filter cloth by the abrazing motion of concrete blocks and subsequently shed ballast along the filter cloth.
  • the application of such rush-mat 10 is, of course, also possible in the embodiments described above.
  • the mattress For transporting the mattress thus manufactured it can be placed on a vessel, for example, a pontoon.
  • the concrete blocks are preferably shifted against each other as is shown on the right-hand side of FIG. 10, whilst the filter cloth located between successive concrete blocks is folded upwards and is clamped in between the successive blocks.
  • a single or double sinking tube 11 is coupled with the front end of the mattress, which tube can be filled with water.
  • the tube is furthermore anchored by means of an anchor 12 so that after it has been lowered by means ofa crane or winch 13 on the vessel the tube will occupy a given position on the ground and will maintain such position.
  • the mattress When the tube 11 is located on the ground, the mattress can be slid off the vessel and be deposited on the ground by gradually hauling the vessel 11a in the direction of the arrow A, as is illustrated in FIGS. 11 and 12. It is preferred to fasten also to the rear end of the mattress a single or double sinking tube to be filled with water 14, which tube is lowered to the ground by means of a crane 3 when the last part of the mattress is sunk.
  • FIG. 13 shows on an enlarged scale one end of the vessel in further detail.
  • the mechanism for controlling the speed of movement of the filter cloth with respect to the vessel comprises two hydraulic cylinders 17 and 18, arranged one behind the other in the direction of movement of the filter cloth and provided with piston rods 19 and 20 respectively, with the free ends of which yokes 21 and 22 respectively are coupled.
  • To the yokes are pivoted gripping members formed by arms 23, to which two spaced, downwardly extending tines 24 and 25 are secured, the distance between said tines corresponding to the width of a concrete block 2.
  • the arms 23 with the tines 24 and 25 are adapted to swing up and down with the aid of setting cylinders 26, fastened to the yokes.
  • the gripping member 23, 25 coupled with said yoke can be turned downwards so that a concrete block gets in between the tines 24 and 25. Then the yoke concerned can be displaced by regulating the fluid supply to the hydraulic cylinder 18 gradually further in the direction of the arrow B in order to regulate the speed with which the mattress slips off the vessel. Near the end of the stroke of the setting cylinder 18 the gripper concerned will be swung upwards with the aid of the setting cylinder 26, after which the yoke 22 is moved back and the cycle described can be repeated.
  • a further possibility of transporting the mattress from the area of manufacture to the area of sinking resides in winding the mattress on a reel 26, the floating capacity of which is sufficiently high for allowing floating transport together with a mattress wound thereon.
  • a reel which may have a diameter of 6 ms, is shown schematically in FIG. 14.
  • the reel is coupled with a vessel 27, which is shown schematically in FIG. 14.
  • the reel is provided at its ends with stub shafts 28 arranged opposite correspondingly shaped recesses 29 in arms 30, secured to the rear end of the vessel, between which arms the reel is navigated.
  • the mattress is then shifted along the deck of the vessel toward the other end of the mattress and the sinking tube 1 1 secured to the front end of the mattress is again lowered in the manner described above with the aid of a crane 13,
  • the vessel is preferably also provided with the system shown schematically in FIG. 13 for the control of the speed of displacement of the mattress.
  • FIGS. 15 to 17 A further, particularly effective possibility of lowering a mattress with the aid of a reel 26 is illustrated in FIGS. 15 to 17.
  • a reel 26, around which a mattress is wound is coupled with a pontoon 27 with the aid of arms (not shown).
  • the reel 26 is coupled with the rear side of the pontoon, viewed in the direction of displacement of the pontoon 27, when a mattress is deposited.
  • Cables 31 are coupled with the ends of the sinking tube 11 connected with winches (not shown) arranged on the pontoon. Further cables 32, also connected with winches (not shown) arranged on the pontoon, are fastened to drums 33 arranged at the ends of the reel.
  • the tube 11 can be lowered to the ground as is shown in FIG. 16, and when the pontoon is moved on the mattress is gradually released from the reel 26 and deposited on the ground.
  • the speed of rotation of the reel 26 and hence the speed of lowering of the mattress are controlled by means of the winches to which the cables 32 are secured.
  • the cables 32 wind up around the drums at the ends of the reel.
  • the end of the mattress released last from the reel is still connected with the reel by means of a cable 34 wound on the reel in order to ensure gradual lowering of said end.
  • FIG. 18 shows a further embodiment of the mattress which is particularly suitable for being wound on a reel.
  • This Figure shows that between the rows of closely adjacentt concrete blocks 2, which rows as stated above are spaced apart by a distance of about 155 cms, further rows of comparatively short concrete blocks 35 are arranged. Viewed in the direction of length ofa row of aligned blocks 35 a fairly large distance is left between the blocks 35, but viewed in the direction of length of the mattress the distance between the blocks 35 and the blocks 2 is fairly small. It will be obvious that since the concrete blocks are spaced apart by a comparatively small distance from each other, viewed in the direction of length of the mattress, the mattress can be more satisfactorily wound regularly on the reel.
  • a further advantage of the provision of the short concrete blocks 35 between the concrete blocks 2, which advantage also becomes manifest when the mattress is deposited in a different way, is that the material subsequently shed on the mattress is prevented from slipping off between the concrete blocks 2, since this material is retained by the short concrete blocks 35.
  • a further advantage of a mattress in accordance with the invention resides in that the filter cloth with the interwoven metal parts can be readily manufactured on a suitable place and can then be transported to the proximity of the area where the mattress has to be lowered.
  • a sufficient quantity of materials can be provided there for the manufacture of the concrete blocks so that the arrangement of the concrete blocks on the filter cloth can be carried out at fairly low costs in the neighbourhood of the area where the mattress has to be lowered, whilst transport of large quantities of materials over large distances, which was frequently required for the conventional mattresses is omitted.
  • the concrete blocks can be fastened by unskilled labour, whereas the manufacture of the conventional mattresses requires high craftmanship.
  • a mattress comprising a filter cloth, bars of metal, plastic or the like being woven in said filter cloth at regular intervals, anchoring members being arranged so as to be linked to said bars woven in said cloth and extending from one face of said cloth, and concrete blocks cast on said filter cloth about said anchoring members,
  • a mattress as claimed in claim 1 characterized in that a rush mat is arranged on the filter cloth and beneath the concrete blocks.
  • a mattress as claimed in claim 1 including rows of spaced, shorter concrete blocks between said first mentioned rows.
  • a mattress comprising a filter cloth, bars of metal, plastic or the like woven in said filter cloth at regular intervals, the ends of said bars being bent so that said ends form eyelets extending from a face of said cloth, concrete blocks embraceable by pairs of said eyelets, and bolts extending through said eyelets into said blocks for coupling said concrete blocks with said filter cloth.
  • a mattress as claimed in claim 7 characterized in that eyelets are provided on each side of the blocks and a bolt is passed through each set of eyelets located on either side of the block and into the block.
  • a mattress as claimed in claim 7 characterized in that a rush mat is arranged on said filter cloth and beneath said concrete blocks.
  • a mattress as claimed in claim l including rows of spaced, shorter concrete blocks between said first mentioned rows.
  • a method of lowering a mattress comprising a flexible filter cloth in which at regular intervals bars of metal, plastic or the like are woven, with which bars concrete blocks are coupled to be spaced apart longitudinally of said mattress, which comprises loading said mattress on a vessel with the concrete blocks shifted towards each other closely by folding the cloth parts situated between the concrete blocks, whereafter one end of the mattress is lowered from the vessel to the ground and anchored on the ground, the mattress being deposited on the ground while the vessel is hauled in a direction away from the anchorage of the mattress, and braking the movement of the mattress in order to ensure gradual lowering of the mattress to the ground such that the cloth is laid in a stretched position.
  • a method as claimed in claim 12 characterized in that a tube is fastened to the end to be anchored to theground, said tube being filled with water for lowering said end with the aid of a winch or a crane.
  • a method for lowering a mattress comprising a flexible filter cloth in which at regular intervals bars of metal, plastic or the like are woven with which bars concrete blocks are coupled the mattress being wound on a reel having adequate floating capacity for holding the reel with the mattress in a floating state, the reel being coupled with a vessel, anchoring one end of the mattress to the ground, the mattress being wound off the reel for depositing on the ground while the vessel is hauled in a direction away from said end of the mattress.
  • a method as claimed in claim 14 characterized in that cables or chains fastened to winches or the like are coupled with drums provided at the ends of the reel for braking the reel.
  • a method as claimed in claim 14 characterized in that the mattress is lowered to the ground on the right-hand side of the reel.
  • a method as claimed in claim 14 characterized in that the reel is coupled with one end of the vessel, the mattress is guided across the vessel and is lowered to the ground at the other end of the vessel.
  • a method as claimed in claim 14 characterized in that at the rear end of the mattress at least one tube to be filled with water is provided, which tube is lowered to the ground with the aid of a winch or a crane.
  • a vessel intended for lowering a mattress comprising a filter cloth having bars of metal, plastic or the like woven thereinto at regular intervals and concrete blocks coupled to said bars, characterized in that the vessel comprises two consecutive gripping members including pivotable hooks adapted to grip around the concrete blocks, first drive means for reciprocating the gripping members on the line of mattress movement with a given phase difference for controlling the movement of the mattress over a deck of the vessel, and second drive means for pivoting the hooks between a gripping position wherein a hook grips a concrete block and a position free of said block.
US395575A 1972-10-06 1973-09-10 Mattress, method of sinking a mattress and vessel suitable for use in said method Expired - Lifetime US3922865A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NLAANVRAGE7213540,A NL169911C (nl) 1972-10-06 1972-10-06 Zinkstuk met vaste ballast.

Publications (1)

Publication Number Publication Date
US3922865A true US3922865A (en) 1975-12-02

Family

ID=19817086

Family Applications (1)

Application Number Title Priority Date Filing Date
US395575A Expired - Lifetime US3922865A (en) 1972-10-06 1973-09-10 Mattress, method of sinking a mattress and vessel suitable for use in said method

Country Status (12)

Country Link
US (1) US3922865A (de)
JP (1) JPS572848B2 (de)
BE (1) BE804456A (de)
CA (1) CA985515A (de)
DE (1) DE2344178C2 (de)
DK (1) DK144071C (de)
FR (1) FR2202522A5 (de)
GB (1) GB1444172A (de)
IT (1) IT1014022B (de)
MY (1) MY7700297A (de)
NL (1) NL169911C (de)
ZA (1) ZA737468B (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4854773A (en) * 1988-06-20 1989-08-08 Nicoll James D Beach carpet
US4896996A (en) * 1989-01-23 1990-01-30 Mouton William J Wave actuated coastal erosion reversal system for shorelines
US4998844A (en) * 1989-01-23 1991-03-12 Charles C. Garvey, Jr. Wave actuated coastal erosion reversal system for shorelines
US5632571A (en) * 1995-05-31 1997-05-27 The Tensar Corporation Concrete geomattress
US5823709A (en) * 1996-07-09 1998-10-20 The Tensar Corporation Interconnected block system
US5911539A (en) * 1996-07-09 1999-06-15 The Tensar Corporation Interconnected block system
US5988942A (en) * 1996-11-12 1999-11-23 Stewart Trustees Limited Erosion control system
CN101881014A (zh) * 2010-07-02 2010-11-10 长江重庆航道工程局 江河航道整治顺水流沉排施工方法
CN102277853A (zh) * 2011-04-26 2011-12-14 中交四航工程研究院有限公司 一种快速可靠的水下铺排新技术
CN103088828A (zh) * 2011-11-01 2013-05-08 中交上海航道局有限公司 铺设水下土工格栅的施工方法
WO2017140980A1 (fr) * 2016-02-15 2017-08-24 Skierniewski Eric Nicolas Element de sous-couche pour digue a talus, et procedes associes de fabrication de sous couche et de digue
US10392764B1 (en) * 2017-11-21 2019-08-27 Premier Concrete Products, Inc. Revetment mat

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1162046B (it) * 1978-06-29 1987-03-18 Poli Giovanni Pamimentatrice subacquea con blocchi in cemento vibrato
NL7904906A (nl) * 1979-06-22 1980-12-24 Harm Last Gerrit Eenkhoorn Ger Werkwijze voor het vervaardigen van een bodembekleding, de bodembekleding en het halfprodukt daarvoor.
FR2469504A1 (fr) * 1979-11-12 1981-05-22 Setec Geotechnique Procede pour la pose d'un revetement sur une surface immergee, et dispositif pour la mise en oeuvre d'un tel procede
NL8005159A (nl) * 1980-09-15 1982-04-01 Nicolon Nv Tegen erosie beschermende mat.
NL2001034C2 (nl) * 2006-11-27 2008-09-08 Tebezo Waterbouw B V Krib.
CN113911271B (zh) * 2021-10-12 2022-09-16 中交第四航务工程局有限公司 一种沉管浮态上驳的方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US236295A (en) * 1881-01-04 Placing mattresses on banks of streams to prevent erosion
US1956967A (en) * 1929-04-16 1934-05-01 Raymond Concrete Pile Co Revetment and method and apparatus for forming the same
US3597928A (en) * 1967-12-22 1971-08-10 Jan Carel Pilaar Erosion control
US3811287A (en) * 1967-04-17 1974-05-21 Winter J De Bottom and bank facing

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Publication number Priority date Publication date Assignee Title
DE155205C (de) *
US1253209A (en) * 1910-09-29 1918-01-15 Chenoweth Concrete Revetment Company Inc Protective covering.
US1597114A (en) * 1925-06-22 1926-08-24 Clark E Jacoby Revetment
GB591824A (en) * 1944-01-14 1947-08-29 Gerard Van Der Rest Method and apparatus for the launching of revetment mats
US2454292A (en) * 1946-04-05 1948-11-23 Andrew B Pickett Revetment mat
US2570271A (en) * 1946-05-23 1951-10-09 Andrew B Pickett Apparatus and process for launching revetments
NL6413926A (de) * 1964-12-01 1966-06-02
JPS4859644A (de) * 1971-11-29 1973-08-21

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US236295A (en) * 1881-01-04 Placing mattresses on banks of streams to prevent erosion
US1956967A (en) * 1929-04-16 1934-05-01 Raymond Concrete Pile Co Revetment and method and apparatus for forming the same
US3811287A (en) * 1967-04-17 1974-05-21 Winter J De Bottom and bank facing
US3597928A (en) * 1967-12-22 1971-08-10 Jan Carel Pilaar Erosion control

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4854773A (en) * 1988-06-20 1989-08-08 Nicoll James D Beach carpet
US4896996A (en) * 1989-01-23 1990-01-30 Mouton William J Wave actuated coastal erosion reversal system for shorelines
US4998844A (en) * 1989-01-23 1991-03-12 Charles C. Garvey, Jr. Wave actuated coastal erosion reversal system for shorelines
US5632571A (en) * 1995-05-31 1997-05-27 The Tensar Corporation Concrete geomattress
US5823709A (en) * 1996-07-09 1998-10-20 The Tensar Corporation Interconnected block system
US5911539A (en) * 1996-07-09 1999-06-15 The Tensar Corporation Interconnected block system
US5988942A (en) * 1996-11-12 1999-11-23 Stewart Trustees Limited Erosion control system
CN101881014A (zh) * 2010-07-02 2010-11-10 长江重庆航道工程局 江河航道整治顺水流沉排施工方法
CN102277853A (zh) * 2011-04-26 2011-12-14 中交四航工程研究院有限公司 一种快速可靠的水下铺排新技术
CN102277853B (zh) * 2011-04-26 2013-04-24 中交四航工程研究院有限公司 一种快速可靠的水下铺排新技术
CN103088828A (zh) * 2011-11-01 2013-05-08 中交上海航道局有限公司 铺设水下土工格栅的施工方法
WO2017140980A1 (fr) * 2016-02-15 2017-08-24 Skierniewski Eric Nicolas Element de sous-couche pour digue a talus, et procedes associes de fabrication de sous couche et de digue
US10392764B1 (en) * 2017-11-21 2019-08-27 Premier Concrete Products, Inc. Revetment mat

Also Published As

Publication number Publication date
DE2344178C2 (de) 1984-01-05
BE804456A (fr) 1974-01-02
DK144071C (da) 1982-05-10
FR2202522A5 (de) 1974-05-03
DE2344178A1 (de) 1974-04-11
JPS4971688A (de) 1974-07-11
NL7213540A (de) 1974-04-09
CA985515A (en) 1976-03-16
MY7700297A (en) 1977-12-31
NL169911B (nl) 1982-04-01
NL169911C (nl) 1982-09-01
GB1444172A (en) 1976-07-28
JPS572848B2 (de) 1982-01-19
ZA737468B (en) 1974-09-25
DK144071B (da) 1981-11-30
IT1014022B (it) 1977-04-20

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