US3840188A - Fluid energy drying and grinding mill - Google Patents

Fluid energy drying and grinding mill Download PDF

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Publication number
US3840188A
US3840188A US00384355A US38435573A US3840188A US 3840188 A US3840188 A US 3840188A US 00384355 A US00384355 A US 00384355A US 38435573 A US38435573 A US 38435573A US 3840188 A US3840188 A US 3840188A
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US
United States
Prior art keywords
passageway
slurry
grinding
chamber
discharge nozzle
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
US00384355A
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English (en)
Inventor
A Coombe
P Muhlmichl
R Stuber
E Danisavich
T Gniewek
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to US00384355A priority Critical patent/US3840188A/en
Priority to AR254949A priority patent/AR204328A1/es
Priority to FI2003/74A priority patent/FI59345C/fi
Priority to ES428778A priority patent/ES428778A1/es
Priority to DE2435181A priority patent/DE2435181A1/de
Priority to ZA00744817A priority patent/ZA744817B/xx
Priority to CA205,844A priority patent/CA1036349A/en
Priority to AU71776/74A priority patent/AU483502B2/en
Priority to DK406574AA priority patent/DK139773B/da
Priority to BE147102A priority patent/BE818271A/xx
Priority to FR7426382A priority patent/FR2239290B1/fr
Priority to BR6269/74A priority patent/BR7406269D0/pt
Priority to NL7410235A priority patent/NL7410235A/xx
Priority to JP8666174A priority patent/JPS5640634B2/ja
Priority to IE1617/74A priority patent/IE39907B1/xx
Priority to GB3384274A priority patent/GB1411369A/en
Priority to IT25817/74A priority patent/IT1027536B/it
Application granted granted Critical
Publication of US3840188A publication Critical patent/US3840188A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/06—Jet mills
    • B02C19/061—Jet mills of the cylindrical type

Definitions

  • a fluid energy mill of the confined vortex type is designed to permit the simultaneous drying and grinding PP 384,355 of slurries of pulverulent solids, e.g., pigment slurries.
  • the slurry is directed into a passageway leading to the 52 US. Cl 241/39, 34/10, 241/5 grinding Chamber in Such a Way as to be enveloped 51 Int. Cl.
  • Most such fluid energy mills are variations on a basic configuration of a generally circular chamber enclosed by a pair of axial wallsand a peripheral wall, the axial length or height of the chamber being substantially less than the diameter.
  • At the periphery of the mill there is located at least one inlet for injecting the gaseous grinding fluid which furnishes the energy for grinding the solids, along with one or more feed devices for introducing the pulverulent solids to be ground.
  • Preferably several uniformly spaced apart inlets for gaseous grinding fluid are provided around the circumference of the mill and they are oriented generally tangentially to the chamber.
  • An outlet coaxial to and in direct communication with the grinding chamber is provided for discharge of the ground solids to a cyclone or bag filter for collection.
  • Fluid energy mills of theforegoing type combine both grinding and classification within a single chamber.
  • gaseous grinding fluid is fed tangentially into the periphery of the chamber along with the solids to be ground a vortex is created whereby the particles are swept along in a spiral path to be eventually discharged at the central outlet.
  • rate and tangency of fluid injection particles above a specific size can be kept within the mill until sufficient attrition occurs, whereas other particles are allowed to pass through.
  • the present invention relates to a fluid energy mill of the confined vortex type as described above but with a feed device that enables it to be used for the simultaneous drying and grinding of flurries of pulverulent solids. More particularly there is used a slurry feed device formed by walls defining a generally rectilinear passageway which opens into a peripheral region of the grinding chamber,
  • FIG. 1 shows a side elevational view, partly in crosssection, of an apparatus of the invention, the slurry feed device being shown generally as A,
  • FIG. 2 is a horizontal view, also partly in crosssection, of the apparatus of FIG. 1 taken normal to the axis at the level of the inlet jets,
  • FIG. 3 illustrates in greater detail the slurry feed device A, the view being a horizontal cross-sectional view
  • FIG. 3a is a cross-sectional view taken across 3a-3a' of FIG. 3.
  • l is a header for gaseous grinding fluid and encircles peripheral wall 2 of generally circular grinding chamber 3.
  • Axial walls 5 and 6 of the chamber may be relatively parallel but in the preferred embodiment, as shown, come closer to one another as the chamber axis is approached.
  • Circular discharge port 7 and exhaust duct 8 are axially located. Fluid from each inlet 4 enters the peripheral wall 2 generally tangentially of the chamber, i.e., at an angle that is tangent to a circle about the center of the chamber which has a radius smaller than the radius of the chamber.
  • a multiplicity of these inlets for gaseous grinding fluid is advantageously used, twelve being convenient for a chamber of 27 inches diameter.
  • a slurry feed device shown generally as A, and to be described more fully hereinafter in connection with FIG. 3, serves to introduce liquid-laden solids, preferably a solids slurry such as a Ti0 pigment slurry in water, to a peripheral region of the chamber through elongated passageway 10, the latter being aligned nearly tangentially to peripheral wall 2 to facilitate flow of the solids into the chamber vortex.
  • Passageway l0 preferably opens into the chamber directly through peripheral wall 2, as shown, but it may alternatively open into the chamber through upper axial wall 5 in close proximity to peripheral wall 2.
  • the cylindrical discharge opening formed by discharge port 7, in conjunction with conical enclosure 9, forms a centrifugal separator into which the ground product settles to be collected while the grinding fluid flows out through exhaust duct 8.
  • annular walls 21, 22 which abut at flanges 23, 24, are held together by bolts 25, with an O-ring gasket 26 in position as shown.
  • An extension of wall 22 forms housing 27 which is adapted to accommodate the entry of high velocity gaseous drying fluid, e.g., high pressure steam supplied via pipe 28, which intersects passageway at a right angle.
  • a slurry supply conduit shown generally as 29 Communicating with passageway 10 in axial alignment with the relatively wider upstream portion thereof is a slurry supply conduit shown generally as 29 which is connected at its feed inlet 30 to a source of the slurry to be dried and ground. Conduit 29 is maintained in position against housing 27 by means of bolts 33. O-rings 35 are in contact with shim plate 34 to assist in preventing leaks of gaseous drying fluid.
  • Conduit 29 extends into housing 27 and is convergently tapered at its forward extremity to form discharge nozzle 36.
  • the latter is centered within the wider portion of passageway 10 leaving a small annular space 37 between passageway lip 38 and discharge nozzle 36 for flow of gaseous drying fluid so as to envelop the stream of slurry emerging from the discharge nozzle and passing into the narrower portion of passageway 10.
  • slurry conduit 29 is composed of inner cylindrical element 41 and outer cylindrical element 42, the two bewng welded at each end.
  • channel 39 for flow of heat exchange fluid, e.g., cold water, therethrough.
  • Elongated baffles 43 and 44 are welded to cylinder 41 and extend nearly the entire length of channel 39.
  • the heat exchange fluid will for the most part enter at threaded connection 45, traverse the length of conduit 29 through channel 39, return and finally exit at threaded connection 46. It is especially desirable that the portion of conduit 29 which is exposed to the high velocity gaseous drying fluid from pipe 28 be able to have its temperature appropriately controlled by the heat exchange fluid.
  • gaseous drying fluid preferably steam
  • flowing through pipe 28 at a relatively low velocity and high pressure undergoes a marked increase in velocity, to at least sonic velocity, as it emerges from what amounts to a converging-diverging nozzle at annular space 37 and comes in contact with slurry passing through discharge nozzle 36 at a relatively low velocity.
  • Mass and heat transfer in the region of the discharge nozzle is extremely rapid. Desirably, enough heat will be supplied by the gaseous drying fluid to permit the temperature of the resulting mixture to remain above saturation temperature.
  • the pulverulent solids will hence be at least surface dry before entering the grinding chamber where they are subjected to the action of a gaseous grinding fluid, which like the gaseous drying fluid is also preferably steam.
  • the envelope of gaseous drying fluid about the stream of slurry issuing from discharge nozzle 36 serves not only in the drying function but also in preventing a buildup of solids along the walls of passageway 10.
  • a flow of a cooling liquid such as chilled water through channel 39 of slurry supply conduit 29 aids in preventing premature drying of the slurry on the inner walls of the conduit or on discharge nozzle 36. It is particularly important at start-up that the discharge nozzle temperature not become excessively high before the slurry flow is commenced in order that solids do not bake out on the inner conduit wall.
  • the material to be dried and ground is a slurry in water of uncoated rutile TiO particles having an average particle size of about 0.22 micron.
  • the solids content of the slurry is 64% by weight and its feed rate is 6100 pounds per hour.
  • the fluid energy mill is that described in connection with the drawings.
  • the axial-walls converge from a height of 3% inch at the periphery to 2% inch at the discharge port.
  • the grinding chamber is 27 inches in diameter.
  • the drying fluid is 800F. steam fed to a 278 inch internal diameter supply pipe at 450 psig and at the rate of 8000 pounds per hours.
  • the annular clearance aurrounding the discharge nozzle of the slurry supply conduit is 0.070 inch.
  • the passageway is 1 /8 inches in diameter at the narrowest portion just beyond the discharge nozzle; and expands to 2 /8 inches in diameter its length from the nozzle to the grinding chamber is 19 inches.
  • the temperature of the steam discharged from the grinding chamber is 338F.
  • the overall steam to pigment ratio is 3.0.
  • the quality of the product is rated equivalent to the same TiO dried separately and ground in a conventional manner. No pluggage of the slurry feed device is encountered throughout an extended run.
  • a fluid energy mill of the confined vortex type for drying and grinding a slurry of pulverulent solids comprising:
  • a generally circular grinding chamber defined by a pair of opposing axial walls and a peripheral wall
  • a slurry feed device formed by walls defining a generally rectilinear passageway which opens into a peripheral region of said chamber, a slurry supply conduit having an inlet remote from said passageway and a discharge nozzle posiof said slurry feed device opens into the peripheral wall of said grinding chamber.
  • Mill according to claim 1 wherein the means for controlling the temperature of the discharge nozzle comprises a channel inside the walls of the slurry supply conduit for flow of a heat exchange medium therethrough.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Drying Of Solid Materials (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Crushing And Grinding (AREA)
US00384355A 1973-07-31 1973-07-31 Fluid energy drying and grinding mill Expired - Lifetime US3840188A (en)

Priority Applications (17)

Application Number Priority Date Filing Date Title
US00384355A US3840188A (en) 1973-07-31 1973-07-31 Fluid energy drying and grinding mill
AR254949A AR204328A1 (es) 1973-07-31 1974-01-01 Molino accionado por energia de fluido del tipo de vertice confinado para secar y moler una suspension de solidos pulverulentos
FI2003/74A FI59345C (fi) 1973-07-31 1974-06-28 Fluidumdriven soenderdelningskvarn
ES428778A ES428778A1 (es) 1973-07-31 1974-07-20 Molino accionado por energia de fluido del tipo de vortice.
DE2435181A DE2435181A1 (de) 1973-07-31 1974-07-22 Mit stroemungsenergie arbeitende muehle zum zerkleinern von feinpulvrigem mahlgut
CA205,844A CA1036349A (en) 1973-07-31 1974-07-29 Fluid energy drying and grinding mill
AU71776/74A AU483502B2 (en) 1973-07-31 1974-07-29 Fluid energy drying and grinding mill
ZA00744817A ZA744817B (en) 1973-07-31 1974-07-29 Fluid energy mill
DK406574AA DK139773B (da) 1973-07-31 1974-07-30 Fluidumdrevet sønderdelingsmølle.
BE147102A BE818271A (fr) 1973-07-31 1974-07-30 Appareil de broyage a energie fluidique
FR7426382A FR2239290B1 (xx) 1973-07-31 1974-07-30
BR6269/74A BR7406269D0 (pt) 1973-07-31 1974-07-30 Moinho de energia a fluido do tipo de vortice confinado para secagem e trituracao
NL7410235A NL7410235A (nl) 1973-07-31 1974-07-30 Fluidumenergiemolen.
JP8666174A JPS5640634B2 (xx) 1973-07-31 1974-07-30
IE1617/74A IE39907B1 (en) 1973-07-31 1974-07-30 Fluid energy drying and grinding mill
GB3384274A GB1411369A (en) 1973-07-31 1974-07-31 Fluid energy drying and grinding mill
IT25817/74A IT1027536B (it) 1973-07-31 1974-07-31 Mulino o macinatore ad energia fluida del tipo a vortice confinato

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00384355A US3840188A (en) 1973-07-31 1973-07-31 Fluid energy drying and grinding mill

Publications (1)

Publication Number Publication Date
US3840188A true US3840188A (en) 1974-10-08

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ID=23517004

Family Applications (1)

Application Number Title Priority Date Filing Date
US00384355A Expired - Lifetime US3840188A (en) 1973-07-31 1973-07-31 Fluid energy drying and grinding mill

Country Status (16)

Country Link
US (1) US3840188A (xx)
JP (1) JPS5640634B2 (xx)
AR (1) AR204328A1 (xx)
BE (1) BE818271A (xx)
BR (1) BR7406269D0 (xx)
CA (1) CA1036349A (xx)
DE (1) DE2435181A1 (xx)
DK (1) DK139773B (xx)
ES (1) ES428778A1 (xx)
FI (1) FI59345C (xx)
FR (1) FR2239290B1 (xx)
GB (1) GB1411369A (xx)
IE (1) IE39907B1 (xx)
IT (1) IT1027536B (xx)
NL (1) NL7410235A (xx)
ZA (1) ZA744817B (xx)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993536A (en) * 1973-09-14 1976-11-23 Chemische Werke Huls Aktiengesellschaft Method for preparing synthetic powders based on polyvinyl chloride or vinyl chloride copolymers containing emulsifiers
US4298229A (en) * 1979-04-11 1981-11-03 Alli Sebastian J D Process for dry mining phosphate ore utilizing a supersonic gas
US4394980A (en) * 1980-05-16 1983-07-26 Draiswerke Gmbh Device for the simultaneous and continuous feeding of pulverulent solids and of liquids into treatment machines
US4565328A (en) * 1983-08-08 1986-01-21 Combustion Engineering, Inc. Sand reclamation system with thermal pipe reclaimer apparatus
US4610395A (en) * 1984-02-27 1986-09-09 Ford James A Process for producing particulate pigment having improved tinctorial characteristics
US5099619A (en) * 1989-08-07 1992-03-31 Rose Leo J Pneumatic particulate blaster
US5281379A (en) * 1989-04-05 1994-01-25 Kanebo, Ltd. Processes for manufacturing thermoplastic resin compositions
US5542613A (en) * 1992-12-10 1996-08-06 Nied; Roland Process for impact crushing of solid particles
US5637344A (en) * 1995-10-20 1997-06-10 Hershey Foods Corporation Chocolate flavored hard candy
US5921481A (en) * 1996-09-25 1999-07-13 Minolta Co., Ltd. Air classifier with specified truncated cone-like breather pipe
US20040169098A1 (en) * 2002-04-11 2004-09-02 Olson Stephen C. Fluid-energy mill
US20050132893A1 (en) * 2003-12-17 2005-06-23 Kraft Foods Holdings, Inc. Process for single-stage heat treatment and grinding of coffee beans
US20060029703A1 (en) * 2004-08-06 2006-02-09 Kraft Foods Holdings, Inc. Process for single-stage heat treatment and grinding of mustard bran, and product and its uses
US20060040027A1 (en) * 2004-08-17 2006-02-23 Kraft Foods Holdings, Inc. Process for manufacture of grated cheese and uses thereof
US20060045951A1 (en) * 2004-09-02 2006-03-02 Kraft Foods Holdings, Inc. Process for selective grinding and recovery of dual-density foods and use thereof
US20060083834A1 (en) * 2004-10-14 2006-04-20 Kraft Foods Holdings, Inc. Process for granulation of wet processed foods and use thereof
US20060088634A1 (en) * 2004-10-25 2006-04-27 Kraft Foods Holdings, Inc. Process for granulation of low-moisture processed foods and use thereof
US20060286246A1 (en) * 2005-06-16 2006-12-21 Kraft Foods Holdings, Inc. Preparation of bakery mixes
US20060286230A1 (en) * 2005-06-15 2006-12-21 Kraft Foods Holdings, Inc. Process for packing separation and granulation of processed food content thereof, and products and uses thereof
US20060286232A1 (en) * 2005-06-15 2006-12-21 Kraft Foods Holdings, Inc. Process for granulation of low-moisture, high-lipid content processed foods and re-use thereof
US20060286269A1 (en) * 2005-06-16 2006-12-21 Kraft Foods Holdings, Inc. Process for granulation of edible seeds
US9357791B2 (en) 2010-07-16 2016-06-07 Kraft Foods R & D, Inc. Coffee products and related processes
WO2024184679A1 (en) * 2023-03-08 2024-09-12 Areka Patents Inc Jet-milling apparatus and method for jet-milling

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8628586D0 (en) * 1986-11-29 1987-01-07 Tioxide Group Plc Mill
GB8720904D0 (en) * 1987-09-05 1987-10-14 Tioxide Group Plc Mill
GB8913819D0 (en) * 1989-06-15 1989-08-02 Tioxide Group Plc Shaped articles
US7465859B2 (en) 2006-06-01 2008-12-16 Fender Musical Instruments Corporation Headblock and fingerboard support
CN116174187B (zh) * 2023-04-27 2023-06-30 厦门威圣邦流体科技有限公司 一种雾化喷射装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE24314C (de) * gebrüder zwanger in Tübingen Kombinirter Back-, Dörr- und Kochofen
US2032827A (en) * 1933-11-21 1936-03-03 Internat Pulverizing Corp Method of and apparatus for providing material in finely divided form
US3317145A (en) * 1964-01-02 1967-05-02 Fluid Energy Proc & Equipment Method and means for pulverizing and drying solids
US3462086A (en) * 1966-07-01 1969-08-19 Du Pont Fluid energy milling process

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993536A (en) * 1973-09-14 1976-11-23 Chemische Werke Huls Aktiengesellschaft Method for preparing synthetic powders based on polyvinyl chloride or vinyl chloride copolymers containing emulsifiers
US4298229A (en) * 1979-04-11 1981-11-03 Alli Sebastian J D Process for dry mining phosphate ore utilizing a supersonic gas
US4394980A (en) * 1980-05-16 1983-07-26 Draiswerke Gmbh Device for the simultaneous and continuous feeding of pulverulent solids and of liquids into treatment machines
US4565328A (en) * 1983-08-08 1986-01-21 Combustion Engineering, Inc. Sand reclamation system with thermal pipe reclaimer apparatus
US4610395A (en) * 1984-02-27 1986-09-09 Ford James A Process for producing particulate pigment having improved tinctorial characteristics
US5281379A (en) * 1989-04-05 1994-01-25 Kanebo, Ltd. Processes for manufacturing thermoplastic resin compositions
US5099619A (en) * 1989-08-07 1992-03-31 Rose Leo J Pneumatic particulate blaster
US5542613A (en) * 1992-12-10 1996-08-06 Nied; Roland Process for impact crushing of solid particles
US5637344A (en) * 1995-10-20 1997-06-10 Hershey Foods Corporation Chocolate flavored hard candy
US5921481A (en) * 1996-09-25 1999-07-13 Minolta Co., Ltd. Air classifier with specified truncated cone-like breather pipe
US7422167B2 (en) * 2002-04-11 2008-09-09 Sturtevant, Inc. Fluid-energy mill
US20040169098A1 (en) * 2002-04-11 2004-09-02 Olson Stephen C. Fluid-energy mill
US20050132893A1 (en) * 2003-12-17 2005-06-23 Kraft Foods Holdings, Inc. Process for single-stage heat treatment and grinding of coffee beans
US20060029703A1 (en) * 2004-08-06 2006-02-09 Kraft Foods Holdings, Inc. Process for single-stage heat treatment and grinding of mustard bran, and product and its uses
US20060040027A1 (en) * 2004-08-17 2006-02-23 Kraft Foods Holdings, Inc. Process for manufacture of grated cheese and uses thereof
US20060045951A1 (en) * 2004-09-02 2006-03-02 Kraft Foods Holdings, Inc. Process for selective grinding and recovery of dual-density foods and use thereof
US7445806B2 (en) 2004-09-02 2008-11-04 Kraft Foods Global Brands Llc Process for selective grinding and recovery of dual-density foods
US20060083834A1 (en) * 2004-10-14 2006-04-20 Kraft Foods Holdings, Inc. Process for granulation of wet processed foods and use thereof
US20060088634A1 (en) * 2004-10-25 2006-04-27 Kraft Foods Holdings, Inc. Process for granulation of low-moisture processed foods and use thereof
US20060286230A1 (en) * 2005-06-15 2006-12-21 Kraft Foods Holdings, Inc. Process for packing separation and granulation of processed food content thereof, and products and uses thereof
US20060286232A1 (en) * 2005-06-15 2006-12-21 Kraft Foods Holdings, Inc. Process for granulation of low-moisture, high-lipid content processed foods and re-use thereof
US20060286246A1 (en) * 2005-06-16 2006-12-21 Kraft Foods Holdings, Inc. Preparation of bakery mixes
US20060286269A1 (en) * 2005-06-16 2006-12-21 Kraft Foods Holdings, Inc. Process for granulation of edible seeds
US9357791B2 (en) 2010-07-16 2016-06-07 Kraft Foods R & D, Inc. Coffee products and related processes
WO2024184679A1 (en) * 2023-03-08 2024-09-12 Areka Patents Inc Jet-milling apparatus and method for jet-milling

Also Published As

Publication number Publication date
AR204328A1 (es) 1975-12-22
IT1027536B (it) 1978-12-20
FI200374A (xx) 1975-02-01
AU7177674A (en) 1976-01-29
BE818271A (fr) 1975-01-30
DK139773B (da) 1979-04-17
FI59345B (fi) 1981-04-30
JPS5640634B2 (xx) 1981-09-22
IE39907L (en) 1975-01-31
JPS5043556A (xx) 1975-04-19
DE2435181A1 (de) 1975-02-13
IE39907B1 (en) 1979-01-31
DK139773C (xx) 1979-09-24
CA1036349A (en) 1978-08-15
FR2239290A1 (xx) 1975-02-28
NL7410235A (nl) 1975-02-04
FR2239290B1 (xx) 1978-01-20
GB1411369A (en) 1975-10-22
ES428778A1 (es) 1976-12-01
DK406574A (xx) 1975-03-10
FI59345C (fi) 1981-08-10
ZA744817B (en) 1975-08-27
BR7406269D0 (pt) 1975-04-22
DE2435181C2 (xx) 1988-04-21

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