US3650480A - Method and an apparatus for producing wood wool - Google Patents

Method and an apparatus for producing wood wool Download PDF

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Publication number
US3650480A
US3650480A US32025A US3650480DA US3650480A US 3650480 A US3650480 A US 3650480A US 32025 A US32025 A US 32025A US 3650480D A US3650480D A US 3650480DA US 3650480 A US3650480 A US 3650480A
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Prior art keywords
tool
sheets
cutting
wool
conveyor
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Expired - Lifetime
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US32025A
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English (en)
Inventor
Gerrit Jan Van Elten
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THERMOFORM AG
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THERMOFORM AG
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Priority claimed from DE19691921867 external-priority patent/DE1921867A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B27L11/02—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood shavings or the like
    • B27L11/04—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood shavings or the like of wood wool

Definitions

  • FIG. 1 is a diagrammatic side view of an apparatus for producing wood wool embodying the invention, the individual ribbons constituting the wool being cut by means of a rotary cutter of the drum type;
  • FIG. 2 is a plan view drawn on an enlarged scale of the rotary disk-shaped planing tool of the apparatus shown in FIG. 1 and of the elements disposed thereabove;
  • FIG. 3 is an elevation of the upper portion of the apparatus shown in FIGS. 1 and 2, partly a section taken along the plane IIIIII of FIG. 2, illustrating feed rollers for feeding the wooden blocks, the planing tool and a conveyor for conveying the sheet sliced from said blocks;
  • FIG. 4 is a partial plan view of another embodiment of the invention illustrating the conveyor extending from the planing tool to the wool cutting station, the wool cutting tool in said station being formed by a rotary of the disk type cutter;
  • FIG. 5 is a side view of the structure shown in FIG. 4;
  • FIG. 6 is a plan view of a modification of the planing tool shown in FIG. 2, such planing tool being provided with air nozzles serving the purpose of depositing and holding down the sheets sliced from the block on the conveyor;
  • FIG. 7 is a partial sectional view of the planing tool shown in FIG. 6, the section being taken along the plane VII-VII in FIG. 6, the view being on an enlarged scale;
  • FIG. 8 is an elevation of the planing tool shown in FIG. 6, partly in section taken along the plane VIII-VIII of FIG. 7 and
  • FIG. 9 is a side view similar to that of FIG. 1 of a modified embodiment differing from that shown in FIG. I by the wool cutter which, in this embodiment, is formed by a reciprocating blade.
  • FIG. 1 A preferred embodiment of the novel apparatus for producing wood wool is shown in FIG. 1.
  • the frame 1 of this apparatus is illustrated diagrammatically only and need not be described in detail.
  • the wood wool produced by the apparatus is indicated at 3. It consists of long curly strips or ribbons of wool produced by shredding starting material in form of sub stantially cylindrical blocks 5 of wood cut to a predetermined length. These blocks 5 are placed one above the other in parallel relationship so as to form a pile.
  • Suitable holding means are provided for holding the pile and for presenting it to one side of a planing tool.
  • such holding means are formed by a pair of parallel sets of feed rollers 7 and 9, each set comprising a plurality of horizontal elongate substantially parallel rollers mounted one above the other.
  • Each roller is provided with longitudinal circumferential teeth capable of engaging an end face of the pile of blocks 5 as shown in FIG. 3.
  • Each roller is journaled in bearings (not shown) mounted in frame 1 for horizontal dis-' placement towards and away from the pile of blocks and suitable springs are provided to urge the bearings towards the pile to thereby ensure a firm grip of the pile of blocks between the two sets of rollers.
  • suitable feeding means are provided for producing a relative feed motion between the holding means 7 and 9 and the tool 11.
  • the feeding means include sprockets 113 fixed to the rollers 7 and 9 and cooperatively connected by chains with a sprocket wheel driven by an electric motor 15 mounted on frame 1.
  • a guiding element 8 can be: provided for avoiding jamming of the block rest under the lowermost feed roller 7.
  • feed rollers other suitable feeding means may be provided, such as endless chains or other conveying means.
  • An important feature of the present invention is the use of a particular type of planing tool, to wit of a substantially diskshaped rotary planing tool provided with at least one cutting edge, but preferably with three cutting edges 25, FIG. 7, angularly spaced by Each cutting edge 25 is provided on a blade 17, 19 or 21, respectively, each disposed within an aperture 23 provided in the disk.
  • the blades l7, l9 and 21 are so mounted that their cutting edge 25 projects above the top surface of the disk, as will appear from FIG. 7.
  • Each blade is fixed to the disk by suitable connecting means including a screw 27. Suitable means are preferably provided, such as slots accommodating the screws, to afford adjustment of the individual blades.
  • the recess 23 Forwardly in the direction of rotation of the tool the recess 23 is confined by an insert 29 forming part of the disk. Its top surface 31 is slightly inclined so as to somewhat project above the plane top surface of the disk.
  • the front 'wall of the recess 23 formed by the insert 29 and the rear wall of the recess are inclined with respect to the axis of rotation of the disk and may slightly converge upwardly, whereas the blade provided with the cutting edge 25 has substantially parallel rear and front walls, the rear wall abutting the inclined rear wall of the recess 23 and being firmly pressed thereon by the fixing means including the screw 27.
  • the front wall or lower wall of the blade is spaced from the front wall of the recess 23 so as to confine a slot therewith adapted to receive a slice 41 of wood cut from the bottom of the lowermost block 5 and to guide such slice or sheet downwardly through the recess 23 and past the bottom of the disk-shaped tool as shown in FIG. 3.
  • the disk is fixed to or integral with a vertical shaft journaled in bearings fixed to the frame 1 of the apparatus.
  • This shaft is geared to the pinion shaft of an electric motor 35 by a suitable transmission diagrammatically indicated in FIG. 1 at 33.
  • the motor being operated at such speed as to ensure that the lowermost block 5 is urged towards the top surface of the disk-shaped tool.
  • the gap formed between the rear edge of top surface 31 of the insert 29 and the cutting edge located above such rear edge has a width corresponding to the desired thickness of the slices or sheets of wood.
  • the rear face of the blade adjoining the edge 25 is slightly relieved so as to provide a suitable relief angle.
  • Conveyor means including an endless conveyor 37 are disposed below the bottom of the tool 11.
  • the conveyor 37 has a supporting surface which is movable past the tool 11 for receiving the sheets for deposition in superimposed staggered relationship like fish scales.
  • the conveyor 37 extends from a point closely below the planing tool 11 to a wool cutting station shown at the right in FIG. 1.
  • Suitable means 39 are disposed above the conveyor 37 for holding down the sheets deposited thereon in staggered relationship.
  • such holding means are formed by an endless belt movable in a path extending parallel to the conveyor 37.
  • the conveyor 37 also is preferably formed formed by an endless belt.
  • air nozzles may be provided on the planing tool 11 so as to direct air jets in the sheet-depositing direction upon each sheet sliced off from the block 5.
  • a plurality of such air nozzles formed by air ducts 43, 45 is provided on the bottom of the disk of tool 11 and on the lower front surface of each blade l7, 19 or 21, respectively, confining the recess 23.
  • the jets issuing from such nozzles are indicated by the arrows 47 in FIG. 3.
  • Compressed air is temporarily supplied to the nozzles 43, 45 by a rotary distributor 49 diagrammatically shown in FIG. 8, whenever the nozzles pass across the conveyor 37.
  • the nozzles 45 may be rearwardly inclined with respect to the rotary cutting motion of the tool 11 as shown in FIG. 7.
  • Experience has shown, however, that even without such air nozzles 43, 45 the apparatus will ensure proper deposition of the sheets. Even when the apparatus is operated at a very high speed, each sheet issued from the recess 23 will be pressed downwardly upon the conveyor by the following sheet discharged from the following recess 23.
  • the endless conveyor 37 and the endless belt 39 are carried by driven rollers and idle rollers journaled in stationary bearings (not shown) carried by frame 1.
  • the driven rollers are driven in timed relationship to the frequency of the sheets issuing from the planing tool, the timed relationship being so chosen that the sheets will be deposited on the conveyor 37 in staggered overlapping relationship like fish scales.
  • a transmission 40 is diagrammatically indicated which cooperatively connects the shaft of the planing tool 11 with a driving belt driving one of the rollers carrying the conveyor 37.
  • This transmission 40 is so designed as to provide for the required timing of the speed of conveyor 37 to the rotary speed of the planing tool 11.
  • FIG. 1 the staggered relationship of the sheets 41 deposited on the conveyor 37 is clearly shown.
  • the conveyor is inclined downwardly towards the wool cutting station, the angle of inclination being such that the staggered sheets assume a substantially horizontal position on the conveyor.
  • Each block 5 of wood represents a section cut from a log in which the fibers extend parallel to the axis thereof.
  • the holding means 7 and 9 are so disposed relative to the axis of the disk-shaped planing tool 11 as to hold the blocks with their fibers extending substantially tangentially to the rotary motion of the planing tool. Therefore, the cutting edges 29 of the planing tool will cut through the wood substantially lengthwise of the fibers. This results in a clean cut avoiding production of dust.
  • the axis of the belt-driven roller of the conveyor 37 extends transversely to the feed rollers 7 and 9. As a result, the direction of travel of the conveyor 37 is parallel to the feed roller 7, 9 and transversely to the fibers of the sheets. In other words, the steady stream of overlapping sheets transported by the conveyor 37 towards the wool cutting station flows in a direction at right angles to the wood fibers. This is important for the operation performed at the wool cutting station as will appear from the description thereof hereinafter.
  • suitable means engaging and accurately aligning the superimposed staggered sheets may be provided below the conveyor 37 as shown in FIGS. 4 and 5.
  • the conveyor 37 may be formed by a plurality of parallel endless belts mounted on the supporting rollers including roller 69 in spaced relationship.
  • a pair of fingers 51 is mounted for pivotal motion about an axis extending horizontally below the conveyor 37 transversely to the belts thereof. This axis performs an orbitary motion about a horizontal stationary axis.
  • a driving mechanism 55 is provided.
  • Each finger 51 has a horizontal arm connected to a crank forming part of the mechanism 55.
  • each finger 51 performs a motion along an oval path causing the finger to emerge above the supporting plane of the conveyor through a gap between the belts to thereby engage the rear edge of a sheet deposited thereon and to push the sheet on the conveyor in downward direction a slight distance thereby aligning it accurately.
  • each finger 51 after having engaged a sheet is retracted downwardly so as to avoid undesirable interference with the sheets.
  • one of the sheets 41 is diagrammatically indicated by broken lines showing engagement of this sheet by the pair of fingers 51, 53.
  • the steady stream of sheets transported by the conveyor 37 with reference to FIG. 4 to the left towards the wool cutting station shown at the left of FIG. 4 is partly omitted in FIG. 4 so as to expose the conveyor 37 to full view.
  • a rotary wool cutter 58 of the drum type is mounted for rotation about a horizontal axis extending substantially parallel to the axes of the rollers carrying the conveyor 37 and the belt 39.
  • the rotary wool cutting tool 58 has a plurality of circumferentially distributed cutting edges extending substantially parallel to the axis of rotation of this tool.
  • the rotary body provided with such cutting edges is carried by a horizontal shaft journaled in bearings mounted on frame 1, preferably in an adjustable position.
  • the axis of this shaft is disposed slightly above the level of a blade 63 forming a stationary cutting edge cooperating with the cutting edges of the rotary cutter 58.
  • This blade 63 is carried by a block 65 (FIG.
  • FIG. 4 differs from that illustrated in FIGS. 1-3 by the tool mounted at the wool cutting station.
  • this tool is illustrated as a substantially diskshaped tool 57 similar to the planing tool. 1 l.
  • the tool 57 has at least one blade inserted in the disk and forming a cutting edge cooperating with the stationary blade 63.
  • the cutting edge similar to edge 25 in FIG. 7 projects from the front plane of the disk a distance corresponding to the desired width of the strips or ribbons of wood cut from the sheets.
  • the relief angle must be at least so large as to avoid interference of the tool with the conveyor motion of the sheets to be shredded.
  • FIG. 9 a third embodiment of the invention is illustrated in which the tool provided at the wool cutting station is of the type comprising a vertical cutting blade, means mounted on the frame for guiding such cutting blade for up and down motion and a crank-driving mechanism 61 operated by an electric motor and adapted to impart a vertical up and down motion to the blade 59.
  • the cutting edge provided by the bottom edge of such blade cooperates with a stationary cutting blade similar to blade 63.
  • the means for actuating blade 59 and the means for guiding such blade may be so designed as to impart a horizontal component of motion to the blade extending in the conveyor direction.
  • the endless conveyor 37 may be provided with longitudinally extending parallel ribs or ridges supporting the steady stream of sheets and the end member 65 supporting the blade 63 may be equipped with a comblike element disposed adjacent to and above the roller 69 having prongs engaging between such ribs or ridges.
  • the shaft carrying the disk-shaped tool 57 may be mounted in stationary bearings, the axis of said shaft extending substantially parallel to the longitudinal direction of the conveyor 37.
  • the bearing may be so adjustable as to tilt the disk-shaped tool 57 about an axis extending parallel to the axis of roller 69.
  • the disk-shaped tool 57 may be brought into any position located between the position shown in FIG. 5 by dotted lines and the position shown in FIG. 5 by full lines.
  • an additional adjustment of the hearing may be provided to turn the tool 57 about an axis extending through the stationary blade 63 at right angles thereto and at right angles to the axis of the tool.
  • This adjustment permits to so position the tool 57 as to cut exactly parallel to the fibers of the wood.
  • this adjustment may be dispensed with provided that the blocks 5 are properly cut so as to ensure that the fibers of the block 5 extend exactly parallel to the conveyor roller axis.
  • the rotary axis of the planing tool 11 is disposed substantially vertically, the feed rollers 7, 9 being disposed above the tool 1 l and the conveyor means being disposed below said tool.
  • the cutting direction of the wool cutting tool 57, 58 or 59 is substantially vertical.
  • the wood wool may be conveyed from the chute 3 by a conveyor 71 to a magazine.
  • the blocks 5 are inserted between the two sets 7 and 9 of feed rollers.
  • the blades 17, 19 and 21 of the planing tool will suecessively slice thin sheets from the bottom of the lowermost block 5. These sheets may have the size ofan ordinary sheet of letter paper.
  • the transmission 33 may impart about 1,000 revolutions per minute to the planing tool 11 resulting in the slicing of 50 sheets per second from the lowermost block.
  • the inclined faces 31 of the inserts 29 will lift the lowermost block somewhat about the top surface of the disk of tool 11 thus reducing the friction between the block and the tool.
  • the speed of operation of the feed rollers 7, 9 is so chosen in relation to the rotary speed of the planing tool and the number of the cutting edges thereof that the slices will have the desired thickness. This thickness will determine the width of the wool strips or wool ribbons.
  • the slices issuing from the recesses 23 of the rotary tool 11 will drop successively upon the supporting surface of the conveyor and are conveyed by the same in a steady stream towards the wool cutting station.
  • the conveyor direction is indicated in FIG. 2 by the arrows A.
  • the sheets dropping upon the conveyor 37 rapidly and successively will overlap each other in staggered relationship. As a result the sheets will form an acute angle with the supporting face of the conveyor.
  • the means 39 for holding the sheets is adjusted in conformity with the thickness of the steady stream of sheets flowing towards the wool cutting station.
  • the width of the strips or ribbons cut in this manner and constituting the wool depends on the speed of operation of the conveyor 37 and on the number of wool cutting operations per time unit. This number again depends on the rotary speed of the cutter 57 or 58 and on the number of cutting blades carried thereby.
  • each sheet is split in its lengthwise direction into a plurality of strips or ribbons by grooving knives or cutter blades, a much smaller number of strips will be produced than is possible with the present invention where a stack of superimposed sheets is cut at the wool cutting station simultaneously.
  • the length of the substantially vertical cutting path being substantially shorter than the length of the individual sheets. While the sheets may have a length of 20 inches for instance, the length of the vertical cutting path of the wool cutting blade may be but 2 inches.
  • rotary tools such as tools 11 and 58
  • the prior method of simultaneously splitting each sheet into a plurality of parallel strips or ribbons by rotary cutting blades or grooving knives requires a much higher power consumption than the operation of the two cutting tools, to wit the planing cutting tool and the wool cutting tool used in the novel method and apparatus.
  • a simple frame of low weight may be used and the sheets may be sliced from the blocks at a very high speed. This is true even where the blocks have a spiral growth and have branches rendering the use of a reciprocating cutting tool difficult. Owing to the high uniform cutting speed of the rotary tools used in the novel apparatus, smooth faces will be obtained even where the wood is fed by automatic means.
  • a method for producing wood wool comprising presenting a block of wood having fibers extending substantially parallel to the axis of said block to a planing tool, imparting a continual cutting motion to said tool and producing a relative feed motion between said block and said tool for slicing successive sheets having substantially longitudinally extending fiber from said block, causing said sheets to drop successively on a supporting surface, imparting a steady motion to said surface having a component directed parallel to said sheets whereby said sheets will be deposited on said supporting surface in superimposed staggered relationship like fish scales, said motion transporting a steady stream of said sheets towards a wool cutting station, and continually moving a cutting edge at said wool cutting station substantially parallel to said longitudinally extending fibers in said sheets for simultaneously cutting wool from said superimposed sheets on said surface.
  • a method for producing wood wool comprising feeding a pile of wooden blocks having fibers extending substantially parallel to the axis of said blocks in downward direction, continually slicing successive sheets having substantially longitudinally extending fibers from the bottom of said pile, moving a supporting surface past the bottom of said pile causing said sheets dropping from the bottom of said pile to be deposited on said supporting surface in superimposed staggered relationship like fish scales, said motion transporting a steady stream of said staggered sheets towards a wool cutting station, and continually cutting wood wool having substantially longitusubstantially disk-shaped laning tool provided with at least one cutting edge, means or imparting rotation to said tool,
  • conveyor means including a conveyor disposed on the other side of said tool and having a supporting surface movable past said tool for receiving said sheets for deposition on said supporting surface in superimposed staggered relationship like fish scales, a wool cutting station, said conveying means extending from a point near said tool and to said station, and a wool cutting tool at said station mounted to perform a cutting motion substantially transversely to said sheets and substantially parallel to said fibers for simultaneously cutting wool from said superimposed sheets, and means cooperatively connected to said conveyor and to said planing tool for operating said conveyor at a speed so correlated to the rotary speed of said planing tool that the distance through which said conveyor travels during the period of slicing a sheet from said block is a small fractionof the average length of
  • Apparatus as claimed in claim 7 further comprising a stationary frame supporting said conveying means and further supporting a counter cutting edge cooperating with said rotary wool cutting tool.
  • Apparatus as claimed in claim 4 further comprising means disposed above said conveyor for holding down the sheets deposited on said conveyor in staggered relationship.
  • Apparatus as claimed in claim 10 in which said means is formed by an endless belt movable in a path extending parallel to said conveyor.
  • Apparatus as claimed in claim 4 further comprising air nozzles provided on said planing tool so as to direct air jets in the sheet-depositing direction upon each sheet sliced off from said block.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Meat, Egg Or Seafood Products (AREA)
US32025A 1969-04-29 1970-04-27 Method and an apparatus for producing wood wool Expired - Lifetime US3650480A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691921867 DE1921867A1 (de) 1969-04-29 1969-04-29 Verfahren und Vorrichtung zum Herstellen von Holzwolle

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US3650480A true US3650480A (en) 1972-03-21

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US32025A Expired - Lifetime US3650480A (en) 1969-04-29 1970-04-27 Method and an apparatus for producing wood wool

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US (1) US3650480A (no)
JP (1) JPS518240B1 (no)
AT (1) AT304850B (no)
BE (1) BE749586A (no)
BG (1) BG21378A3 (no)
CA (1) CA920483A (no)
CH (1) CH518785A (no)
DK (1) DK129322B (no)
ES (1) ES379134A1 (no)
FR (1) FR2040391A1 (no)
GB (1) GB1308524A (no)
HU (1) HU167896B (no)
IE (1) IE34703B1 (no)
NL (1) NL7006096A (no)
NO (1) NO133578C (no)
PL (1) PL71516B1 (no)
RO (1) RO56259A (no)
SE (1) SE370348B (no)
TR (1) TR16642A (no)
YU (1) YU33698B (no)
ZA (1) ZA702735B (no)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3964716A (en) * 1970-09-03 1976-06-22 Mccorkle Alfred S Wood processing unit for reducing air pollution
AT397488B (de) * 1992-02-17 1994-04-25 Hofer Otto Verfahren und anlage zum bearbeiten von spanend gewonnenem holzmaterial
US20100133949A1 (en) * 2005-06-28 2010-06-03 Kolektor Group D.O.O. Conductor blank for a drum commutator, a method for the production thereof, and a drum commutator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52120633U (no) * 1976-03-06 1977-09-13
AT402810B (de) * 1994-09-06 1997-09-25 Hofer Otto Vorrichtung zum verarbeiten von holzmaterial

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US357129A (en) * 1887-02-01 Manufacture of tannin extract from wood
US1473545A (en) * 1921-10-24 1923-11-06 William H Collier Splint machine
US1743435A (en) * 1928-03-03 1930-01-14 John H Dalen Rotary slicing machine
US2269352A (en) * 1939-05-02 1942-01-06 John J Bacon Woodcutting machine
US2559701A (en) * 1946-05-22 1951-07-10 M And M Wood Working Company Hog machine having rotary cutter and feed conveyer
US2811183A (en) * 1953-06-15 1957-10-29 Int Paper Co Wood defibering apparatus
US3266538A (en) * 1962-10-24 1966-08-16 Joenkoeping Vulcan Ab Apparatus for peeling and disintegrating of veneer
US3335771A (en) * 1965-07-08 1967-08-15 Fulghum Ind Inc Veneer chipper

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US357129A (en) * 1887-02-01 Manufacture of tannin extract from wood
US1473545A (en) * 1921-10-24 1923-11-06 William H Collier Splint machine
US1743435A (en) * 1928-03-03 1930-01-14 John H Dalen Rotary slicing machine
US2269352A (en) * 1939-05-02 1942-01-06 John J Bacon Woodcutting machine
US2559701A (en) * 1946-05-22 1951-07-10 M And M Wood Working Company Hog machine having rotary cutter and feed conveyer
US2811183A (en) * 1953-06-15 1957-10-29 Int Paper Co Wood defibering apparatus
US3266538A (en) * 1962-10-24 1966-08-16 Joenkoeping Vulcan Ab Apparatus for peeling and disintegrating of veneer
US3335771A (en) * 1965-07-08 1967-08-15 Fulghum Ind Inc Veneer chipper

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3964716A (en) * 1970-09-03 1976-06-22 Mccorkle Alfred S Wood processing unit for reducing air pollution
AT397488B (de) * 1992-02-17 1994-04-25 Hofer Otto Verfahren und anlage zum bearbeiten von spanend gewonnenem holzmaterial
US20100133949A1 (en) * 2005-06-28 2010-06-03 Kolektor Group D.O.O. Conductor blank for a drum commutator, a method for the production thereof, and a drum commutator

Also Published As

Publication number Publication date
DK129322B (da) 1974-09-30
YU33698B (en) 1978-02-28
AT304850B (de) 1973-01-25
ES379134A1 (es) 1973-03-16
IE34703L (en) 1970-10-29
SU381202A3 (no) 1973-05-15
NL7006096A (no) 1970-11-02
IE34703B1 (en) 1975-07-23
BG21378A3 (no) 1976-05-20
ZA702735B (en) 1971-01-27
PL71516B1 (en) 1974-06-29
BE749586A (fr) 1970-10-01
JPS518240B1 (no) 1976-03-15
YU107570A (en) 1977-08-31
HU167896B (no) 1976-01-28
DK129322C (no) 1975-02-17
GB1308524A (en) 1973-02-21
RO56259A (no) 1974-04-01
CA920483A (en) 1973-02-06
SE370348B (no) 1974-10-14
TR16642A (tr) 1973-01-01
FR2040391A1 (no) 1971-01-22
NO133578C (no) 1976-05-26
NO133578B (no) 1976-02-16
CH518785A (de) 1972-02-15

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