WO1990011590A1 - Display stands - Google Patents

Display stands Download PDF

Info

Publication number
WO1990011590A1
WO1990011590A1 PCT/GB1990/000399 GB9000399W WO9011590A1 WO 1990011590 A1 WO1990011590 A1 WO 1990011590A1 GB 9000399 W GB9000399 W GB 9000399W WO 9011590 A1 WO9011590 A1 WO 9011590A1
Authority
WO
WIPO (PCT)
Prior art keywords
slot
base
panel
display
stand according
Prior art date
Application number
PCT/GB1990/000399
Other languages
French (fr)
Inventor
Spencer Hannah
Original Assignee
A.C. Edwards Plc
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
Application filed by A.C. Edwards Plc filed Critical A.C. Edwards Plc
Publication of WO1990011590A1 publication Critical patent/WO1990011590A1/en

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F15/00—Boards, hoardings, pillars, or like structures for notices, placards, posters, or the like
    • G09F15/0006—Boards, hoardings, pillars, or like structures for notices, placards, posters, or the like planar structures comprising one or more panels
    • G09F15/0056—Boards, hoardings, pillars, or like structures for notices, placards, posters, or the like planar structures comprising one or more panels portable display standards
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
    • E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
    • E01F9/688—Free-standing bodies
    • E01F9/692—Portable base members therefor

Definitions

  • This invention relates to portable display stands of the kind that are used for displaying notices, warnings, signs, advertisements and so forth to be assimilated by passers-by both indoors and particularly out-of-doors in wind.
  • Such display stands are sometimes subjected to hard usage resulting from carelessness, heavy weather and vandalism so that they are constructed in a somewhat elaborate way.
  • a portable display stand comprises a base formed to cover an area of a supporting surface for the stand while presenting a substantially continuous exposed surface from one outer line of contact with the supporting surface to such a outer line of contact on the opposite side of the stand, except for a longitudinal slot centrally located betwee the two said lines of contact and a display panel havin its lower edge faces fitted into the slot and rising vertically therefrom a distance at least equal to the maxi ⁇ tum distance between said two outer lines of contact, means being provided for securing said display panel in the slot. While the plan form of the base may very conveniently be rectangular, other shapes are possible.
  • the said outer lines of contact may be arcuate with the ends of each arc being located close to the ends of the slot.
  • the means provided for securing the display panel in the slot may advantageously consist in providing a friction fit between the panel and the faces of the slot. If necessary further means may be provided for securing the panel in a cavity beneath the slot and exposed beneath the base. In another alternative the lower edge of the panel is put into an elongated member that grips the panel by being forced into the slot.
  • the aforesaid exposed surface of the base may conveniently be a cambered surface extending between the sides of the base.
  • the aerodynamic structure is such that the panel is a metal sheet of a size that, when the stand is standing out-of-doors, it will bend progressively as a head-on wind speed increases and the weight of the base is such that the stand will remain stationary in a wind speed of at least 45 mph.
  • the base may be a unitary member moulded from plastics material, such as recycled thermoplastics, thermosets or a combination of both.
  • Fig. 1 is a plan of a base or plinth forming part of a display stand
  • Fig. 2 is a vertical section taken on line A-A in Fig. 1;
  • Fig. 3 is a vertical section taken on line B-B in Fig. 1;
  • Fig. 4 is an end view shown partly in section of the base shown in Fig 1;
  • Fig. 5 is an end view of a modification of the base shown in Figs. 1 to 4 with a display panel mounted thereon;
  • Fig. 6 is a front view of the display panel shown in Fig. 5;
  • Fig. 7 is an exploded axiometric view of a further modification of the display stand of Figs 1 to 4, the display panel being shown separated from the base; and
  • Fig. 8 is a view similar to that of Fig. 7 but Figure 9 is an axiometric view showing a further modification of the display stand.
  • the base or plinth 1 is formed with a central vertical slot 2 for receiving the lower edge faces of a rectangular display panel 3 (such as shown in Fig. 6).
  • the base 1 is formed with a cambered top surface 4 which is uniform along the length of the base between its ends 5 and curves downwards to low vertical sides 6, the slot 2 being located longitudinally at the centre of the surface 4.
  • the base is formed from recycled thermoplastics, thermosets or a combination of both and is coffered underneath as shown at 10, the coffering only being shown in the lower part of Fig. 1 so that it only rests on the bottoms of its sides and ends, the divisions between the coffers 10 and a closure portion 7 defining the bottom of the slot 2.
  • Each end wall 5 of the base is formed with an undercut recess 8 which internally has an upwardly extending part 9 (Fig. 2) to provide a handle.
  • the length of the base is 585 mm, its width 500 mm, its height 70 mm, the length of the slot 505 mm, depth of slot 60 mm and width of slot 18 mm.
  • the display panel 3 and consists of aluminium or it may consist of zinc coated steel. The body of the panel is held tightly between vertical ridges 12 formed on the opposite faces of the slot. The height of the vertical display panel may be 900 mm so that when out-of-doors it can bend in the wind.
  • Figures 5 and 6 show an alternative way of making sure that the lower end of the panel 3 is firmly retained in the slot 2.
  • a portion 14 of the base 1 containing the slot 2 terminates at the top of a cavity 15 in the bottom of the base, lips 16, 17 extended downwards from the portion 14 into the cavity 15.
  • These lips have registering holes that register with a hole 18 (Fig. 6) in the panel 3 when the panel is inserted through the slot 2 and between the lips.
  • a retainer 19 can then be passed through the three holes to hold the panel against rising in the base.
  • the slot 2 extends the whole width of the base and is further extended at each end by a pair of parallel flanges 13 each provided with a hole that registers with a hole 14 at the corner of the panel 3 so that a peg, such as a screw, can be used to secure the panel.
  • the slot 2 may be extended upwards by parallel flanges rising from the cambered surface 4 on each face of the panel 3 and secured to the panel by pegs passing through holes in the panel.
  • Figure 8 shows another way of ensuring that an adequate grip is provided between the slot 2 and panel 3. This is useful in any process where the moulding of the recycled material may not be sufficiently accurate to reach the required tolerances.
  • An elongated grip member 20 provides an inner slot 21 between side walls 22 that receives the lower edge of the panel 3. There is a wedge action between the slot 2 and the member 20 when the latter is inserted which seals the panel in situ.
  • each base 1 shown in the drawings is retangular in plan, it is to be understood that other plan forms may be used.
  • the base 1 may be circular in plan with the slot on a diameter.
  • the example shown in Figure 9 has been designed. This weighs 12 Kg and its length is 880 m and its width 750 mm. It will be seen that while substantial portions of the shape of base shown in Figures 1 to 5 and 8 have been removed from each side, the outer lines 25, 26, 27, 28, 29 of contact with the supporting surface on opposite sides provide boundaries for a continuous surface comprising the cambered surface 4 and on each side vertical surfaces 30, 31, 32. This has been found to provide an aerodynamic result approaching that of the shape of Figures 1 to 5 and 8.
  • the shape of the base may be considered to consist of a central longitudinal body 3 with the slot 2 centrally disposed therein with two feet 32 at each end radiating therefrom respectively on opposite sides on the top surfaces of the body and feet merging into one another.

Abstract

A display stand comprises a sheet metal display panel having its lower edge faces fitted into a central slot (2) in a base (1) having a cambered top surface (4). One way described for retaining the panel in the slot consists in shaping the faces to provide a friction fit. The design aims at providing stability out-of-doors in a high wind.

Description

DISPLAY STANDS
This invention relates to portable display stands of the kind that are used for displaying notices, warnings, signs, advertisements and so forth to be assimilated by passers-by both indoors and particularly out-of-doors in wind.
Such display stands are sometimes subjected to hard usage resulting from carelessness, heavy weather and vandalism so that they are constructed in a somewhat elaborate way.
It is an object of the invention to provide a form of display stand that is particularly simple, robust, and economical to produce, and will remain stable in high winds. According to the present invention, a portable display stand comprises a base formed to cover an area of a supporting surface for the stand while presenting a substantially continuous exposed surface from one outer line of contact with the supporting surface to such a outer line of contact on the opposite side of the stand, except for a longitudinal slot centrally located betwee the two said lines of contact and a display panel havin its lower edge faces fitted into the slot and rising vertically therefrom a distance at least equal to the maxiπtum distance between said two outer lines of contact, means being provided for securing said display panel in the slot. While the plan form of the base may very conveniently be rectangular, other shapes are possible. For example the said outer lines of contact may be arcuate with the ends of each arc being located close to the ends of the slot. The means provided for securing the display panel in the slot may advantageously consist in providing a friction fit between the panel and the faces of the slot. If necessary further means may be provided for securing the panel in a cavity beneath the slot and exposed beneath the base. In another alternative the lower edge of the panel is put into an elongated member that grips the panel by being forced into the slot.
The aforesaid exposed surface of the base may conveniently be a cambered surface extending between the sides of the base. Advantageously the aerodynamic structure is such that the panel is a metal sheet of a size that, when the stand is standing out-of-doors, it will bend progressively as a head-on wind speed increases and the weight of the base is such that the stand will remain stationary in a wind speed of at least 45 mph.
Very advantageously the base may be a unitary member moulded from plastics material, such as recycled thermoplastics, thermosets or a combination of both.
In order that the invention may be clearly understood and readily carried into effect portable display stands in accordance therewith will now be described, by way of example, with reference to the accompanying drawings, in which:
Fig. 1 is a plan of a base or plinth forming part of a display stand;
Fig. 2 is a vertical section taken on line A-A in Fig. 1; Fig. 3 is a vertical section taken on line B-B in Fig. 1;
Fig. 4 is an end view shown partly in section of the base shown in Fig 1; Fig. 5 is an end view of a modification of the base shown in Figs. 1 to 4 with a display panel mounted thereon;
Fig. 6 is a front view of the display panel shown in Fig. 5; Fig. 7 is an exploded axiometric view of a further modification of the display stand of Figs 1 to 4, the display panel being shown separated from the base; and Fig. 8 is a view similar to that of Fig. 7 but Figure 9 is an axiometric view showing a further modification of the display stand.
Referring to Figs. 1 to 4, the base or plinth 1 is formed with a central vertical slot 2 for receiving the lower edge faces of a rectangular display panel 3 (such as shown in Fig. 6). The base 1 is formed with a cambered top surface 4 which is uniform along the length of the base between its ends 5 and curves downwards to low vertical sides 6, the slot 2 being located longitudinally at the centre of the surface 4. The base is formed from recycled thermoplastics, thermosets or a combination of both and is coffered underneath as shown at 10, the coffering only being shown in the lower part of Fig. 1 so that it only rests on the bottoms of its sides and ends, the divisions between the coffers 10 and a closure portion 7 defining the bottom of the slot 2.
Each end wall 5 of the base is formed with an undercut recess 8 which internally has an upwardly extending part 9 (Fig. 2) to provide a handle.
In one example of the display stand shown in Figs. 1 to 4, the length of the base is 585 mm, its width 500 mm, its height 70 mm, the length of the slot 505 mm, depth of slot 60 mm and width of slot 18 mm. The display panel 3 and consists of aluminium or it may consist of zinc coated steel. The body of the panel is held tightly between vertical ridges 12 formed on the opposite faces of the slot. The height of the vertical display panel may be 900 mm so that when out-of-doors it can bend in the wind.
Tests on a display sign as described above have been effected in the 15 ft. Wind Tunnel at Hatfield, the panel being of aluminium and having the dimensions 500 mm x 900 mm. It was found that the panel bent progressively as the wind speed increased. With a 20 gauge panel and the base fully weighted to 25 lb (11.34 kg) the tunnel was run up to 45 mph and later to 51 mph without the display stand sliding or toppling. In each case the test was stopped for reasons unconnected with the test. In a third test the display stand began to flutter at 55 mph and it began to lift at 58 mph. In a fourth test with an 18 gauge panel and the same base weight, the panel began to flutter at 61 mph, getting worse at 64 mph. The stand slid backwards at 70 mph. In a fifth test with an 18 gauge panel and a base weight of 19.75 lb (8.96 kg), the base began to vibrate at 42 mph and the stand began to oscillate at 50 mph. The display sign, however, was still steady at 50 mph. In a sixth test with an 18 gauge panel and a base weight of 14.5 lb (6.57 kg), the base began to vibrate at 30 mph and the panel began to oscillate at 50 mph.
Figures 5 and 6 show an alternative way of making sure that the lower end of the panel 3 is firmly retained in the slot 2. In this case a portion 14 of the base 1 containing the slot 2 terminates at the top of a cavity 15 in the bottom of the base, lips 16, 17 extended downwards from the portion 14 into the cavity 15. These lips have registering holes that register with a hole 18 (Fig. 6) in the panel 3 when the panel is inserted through the slot 2 and between the lips. A retainer 19 can then be passed through the three holes to hold the panel against rising in the base.
In the modification of Fig. 7 the slot 2 extends the whole width of the base and is further extended at each end by a pair of parallel flanges 13 each provided with a hole that registers with a hole 14 at the corner of the panel 3 so that a peg, such as a screw, can be used to secure the panel. Alternatively the slot 2 may be extended upwards by parallel flanges rising from the cambered surface 4 on each face of the panel 3 and secured to the panel by pegs passing through holes in the panel.
Figure 8 shows another way of ensuring that an adequate grip is provided between the slot 2 and panel 3. This is useful in any process where the moulding of the recycled material may not be sufficiently accurate to reach the required tolerances. An elongated grip member 20 provides an inner slot 21 between side walls 22 that receives the lower edge of the panel 3. There is a wedge action between the slot 2 and the member 20 when the latter is inserted which seals the panel in situ. There are male formations 23 at the ends of the member 20 that fit correspondingly shaped female formations 24 at the ends of the slot 2 to ensure that the member 20 is squarely inserted in the slot 2.
While each base 1 shown in the drawings is retangular in plan, it is to be understood that other plan forms may be used. For example the base 1 may be circular in plan with the slot on a diameter.
It will be appreciated that for signs rather larger than those described above the weight can become too great for reasonably easy manual handling and yet it is necessary to retain the aerodynamic control in high winds. Therefore, the example shown in Figure 9 has been designed. This weighs 12 Kg and its length is 880 m and its width 750 mm. It will be seen that while substantial portions of the shape of base shown in Figures 1 to 5 and 8 have been removed from each side, the outer lines 25, 26, 27, 28, 29 of contact with the supporting surface on opposite sides provide boundaries for a continuous surface comprising the cambered surface 4 and on each side vertical surfaces 30, 31, 32. This has been found to provide an aerodynamic result approaching that of the shape of Figures 1 to 5 and 8. Broadly the shape of the base may be considered to consist of a central longitudinal body 3 with the slot 2 centrally disposed therein with two feet 32 at each end radiating therefrom respectively on opposite sides on the top surfaces of the body and feet merging into one another.

Claims

CLAIMS:
1. A portable display stand comprising a base formed to stand on a supporting surface and a display panel extending vertically upwards from the base, characterised in that the base (1) is formed to cover the area of a supporting surface for the stand while presenting a substantially continuous exposed surface (4) from one outer line of contact with the supporting surface to such an outer line of contact on the opposite side of the stand, except for a longitudinal slot (2) centrally located between the two said lines of contact and that the display panel has its lower edge faces fitted into the slot and rises vertically therefrom a distance at least equal to the maximum distance between said two outer lines of contact, means being provided for securing said display panel in the slot.
2. A display stand according to Claim 1, characterised in that the said continuous exposed surface is a cambered surface extending between the two lines of contact.
3. A display stand according to Claim 1, characterised in that the panel is a metal sheet of a size that, when the stand is standing out-of-doors, it will bend progressively as a head-on wind speed increases and the weight of the base is such that the stand will remain stationary in a wind speed of at least 45 mph.
4. A display stand according to Claim 1, characterised in that said means provided for securing said display panel in the slot consist in providing a friction fit between said panel and faces of said slot.
5. A display stand according to Claim 4, characterised in that opposite faces of said slot are formed with ridges
(12) arranged to engage opposite faces of the panel and the slot is closed at the bottom by a horizontal portion
(7) of the base.
6. A display stand according to Claim 1, characterised in that the said exposed surface comprises a cambered surface extending between the sides of the base.
7. A display stand according to Claim 1, characterised in that the base is a unitary member moulded from plastics material.
8. A display stand according to Claim 1, characterised in that the base has a coffered under surface (10) and is formed to stand on a supporting surface substantially all round the edge of the base.
9. A display stand according to Claim 1, characterised in that the base is formed with a cavity (15) beneath the slot and means (16, 17, 19) are provided in the cavity for securing the lower edge of the panel to the base.
10. A display stand according to Claim 1, characterised in that the lower edge of the panel is fitted into an elongated grip member (20) which, on being thrust into the slot, by wedge action seals the panel in the slot.
11. A display stand according to Claim 1, characterised in that said means provided for securing the display panel in the slot comprise pairs of parallel flanges (13) extending the slot laterally or vertically, the flanges in each pair being arranged to lie against opposite faces of the panel and formed with holes mating with a hole (14) in the panel for receiving a peg.
12. A display stand according to Claim 1, characterised in that the base is formed with a central longitudinal body (31) with the slot (2) centrally disposed therein with two feet (32) at each end radiating therefrom respectively on opposite sides and the top surfaces of the body and feet merging into one another.
PCT/GB1990/000399 1989-03-17 1990-03-16 Display stands WO1990011590A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8906192.3 1989-03-17
GB898906192A GB8906192D0 (en) 1989-03-17 1989-03-17 Display stands

Publications (1)

Publication Number Publication Date
WO1990011590A1 true WO1990011590A1 (en) 1990-10-04

Family

ID=10653541

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1990/000399 WO1990011590A1 (en) 1989-03-17 1990-03-16 Display stands

Country Status (6)

Country Link
AU (1) AU5288590A (en)
GB (2) GB8906192D0 (en)
GR (1) GR1000290B (en)
NZ (1) NZ232965A (en)
WO (1) WO1990011590A1 (en)
ZA (2) ZA902036B (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5255803A (en) * 1991-04-03 1993-10-26 Hamilton Fixture Company Merchandising system
WO1996011461A1 (en) * 1994-10-05 1996-04-18 Albert Rene Smink A device and a method for supporting a flat object, such as an advertising board
FR2728288A1 (en) * 1994-12-19 1996-06-21 Carrie Marcel Flexible base for road sign used esp. for temporary signalling
US5537767A (en) * 1995-06-06 1996-07-23 Tri-Molded Plastics Inc. Modular display stand
FR2739478A1 (en) * 1995-10-02 1997-04-04 Carrie Marcel IMPROVEMENTS TO A BASE ASSEMBLY WITH INTEGRATED STANDS AND FLEXIBLE SIGNALING PANEL
FR2739477A1 (en) * 1995-10-02 1997-04-04 Carrie Marcel Temporary road sign and base
EP0809227A1 (en) * 1996-05-22 1997-11-26 Signwaves Ltd Sign stand
NL1005920C2 (en) * 1997-04-28 1998-10-29 Raalte Reklame B V Van Foot piece for support of board with publicity or other text
FR2767545A1 (en) * 1997-08-25 1999-02-26 Marcel Carrie BASE AND FLEXIBLE ALIGNMENT ROAD BEAM ASSEMBLY
NL1010380C2 (en) * 1998-10-23 2000-04-26 Heijting Aannemersbedrijf En H Notice board as well as an assembly of such notice board and a gantry crane truck.
EP2187447A3 (en) * 2008-08-13 2011-11-09 Solon Se Fitting device for solar modules with a large aspect ratio

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1926703A1 (en) * 1969-05-24 1970-11-26 Guenther Gubela Road traffic beacon with elastic qualities
DE2949541A1 (en) * 1979-12-10 1981-06-11 Wilhelm 7150 Backnang Junker Impact diminishing road signpost releasable base plate - has grooves in roof shaped top base faces forming continuous channel
DE3411488A1 (en) * 1984-03-28 1985-10-31 Wilhelm 7150 Backnang Junker Beacon stand
EP0257226A2 (en) * 1986-06-25 1988-03-02 Aph Road Safety Limited Traffic bollards and base for a traffic bollard

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1926703A1 (en) * 1969-05-24 1970-11-26 Guenther Gubela Road traffic beacon with elastic qualities
DE2949541A1 (en) * 1979-12-10 1981-06-11 Wilhelm 7150 Backnang Junker Impact diminishing road signpost releasable base plate - has grooves in roof shaped top base faces forming continuous channel
DE3411488A1 (en) * 1984-03-28 1985-10-31 Wilhelm 7150 Backnang Junker Beacon stand
EP0257226A2 (en) * 1986-06-25 1988-03-02 Aph Road Safety Limited Traffic bollards and base for a traffic bollard

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Highways, Volume 53, No. 1904, August 1985, (Croydon, Surrey, GB), "Flat Cone Authorised for Trials", page 20 *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5255803A (en) * 1991-04-03 1993-10-26 Hamilton Fixture Company Merchandising system
WO1996011461A1 (en) * 1994-10-05 1996-04-18 Albert Rene Smink A device and a method for supporting a flat object, such as an advertising board
NL9401634A (en) * 1994-10-05 1996-05-01 Albert Rene Smink Apparatus and method for supporting a flat object, such as a billboard.
FR2728288A1 (en) * 1994-12-19 1996-06-21 Carrie Marcel Flexible base for road sign used esp. for temporary signalling
US5537767A (en) * 1995-06-06 1996-07-23 Tri-Molded Plastics Inc. Modular display stand
FR2739478A1 (en) * 1995-10-02 1997-04-04 Carrie Marcel IMPROVEMENTS TO A BASE ASSEMBLY WITH INTEGRATED STANDS AND FLEXIBLE SIGNALING PANEL
FR2739477A1 (en) * 1995-10-02 1997-04-04 Carrie Marcel Temporary road sign and base
EP0767276A1 (en) * 1995-10-02 1997-04-09 Marcel Carrie Base and temporary flexible roadsign and its improvements
EP0809227A1 (en) * 1996-05-22 1997-11-26 Signwaves Ltd Sign stand
NL1005920C2 (en) * 1997-04-28 1998-10-29 Raalte Reklame B V Van Foot piece for support of board with publicity or other text
FR2767545A1 (en) * 1997-08-25 1999-02-26 Marcel Carrie BASE AND FLEXIBLE ALIGNMENT ROAD BEAM ASSEMBLY
EP0899381A1 (en) * 1997-08-25 1999-03-03 Marcel Carrie Complex of base and upright traffic marker
NL1010380C2 (en) * 1998-10-23 2000-04-26 Heijting Aannemersbedrijf En H Notice board as well as an assembly of such notice board and a gantry crane truck.
EP1193670A1 (en) * 1998-10-23 2002-04-03 Bordbusters B.V. i.o. Infoboard and assembly of such infoboard and a portal crane truck
EP2187447A3 (en) * 2008-08-13 2011-11-09 Solon Se Fitting device for solar modules with a large aspect ratio
US8341895B2 (en) 2008-08-13 2013-01-01 Solon Se Mounting device for solar modules having a large aspect ratio

Also Published As

Publication number Publication date
GR900100197A (en) 1990-07-31
AU5288590A (en) 1990-10-22
GB9119664D0 (en) 1991-12-04
ZA902036B (en) 1990-12-28
GR1000290B (en) 1992-05-12
GB2247555A (en) 1992-03-04
ZA902035B (en) 1990-12-28
NZ232965A (en) 1992-08-26
GB2247555B (en) 1993-04-07
GB8906192D0 (en) 1989-05-04

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