US3787101A - Rock cutter assembly - Google Patents

Rock cutter assembly Download PDF

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Publication number
US3787101A
US3787101A US00249364A US3787101DA US3787101A US 3787101 A US3787101 A US 3787101A US 00249364 A US00249364 A US 00249364A US 3787101D A US3787101D A US 3787101DA US 3787101 A US3787101 A US 3787101A
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US
United States
Prior art keywords
caps
cutter wheel
members
recesses
side caps
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
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US00249364A
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English (en)
Inventor
D Sugden
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.)
Robbins Co
Original Assignee
Robbins Co
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Filing date
Publication date
Application filed by Robbins Co filed Critical Robbins Co
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Publication of US3787101A publication Critical patent/US3787101A/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E21B10/10—Roller bits with roller axle supported at both ends
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E21B10/12—Roller bits with discs cutters
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/10—Making by using boring or cutting machines
    • E21D9/1006—Making by using boring or cutting machines with rotary cutting tools
    • E21D9/104—Cutting tool fixtures

Definitions

  • a cutter wheel is mounted for rotation about an elongated support shaft which is interconnected between a pair of relatively large diameter side caps.
  • Base portions of the side caps snugly fit within recesses formed in side members of a mounting frame.
  • the side caps include narrower exposed portions in their extent outwardly of the recesses.
  • Retainer members secured to said side members overhang said recesses to contact and bear against the base portions of the side caps At least some of the retainer members are detachable from said end members so that they can be removed to permit installation of the side caps into, or removal out from, said recesses.
  • mounts utilizes an axially removable load pin which spans the space between opposite end portions of a mounting saddle. Examples of these mounts are disclosed by US. Pat. No. 3,389,760, granted June 25, 1968 to Wilford V. Morris, and by US. Pat. No. 3,449,024, granted June 10, 1969 to Carl L. Lichte.
  • Another known mount utilizes clamps and bolts for securing a support pin or shaft to the end standards. Examples of this type of mount are disclosed by US. Pat. No. 3,216,513, granted Nov. 9, 1965 to Richard 1. Robbins and Douglas F. Winberg, and by US. Pat. No. 3,612,196, granted Oct. 12, 1971 to Robert L.
  • U.S. Pat. No. 3,612,196 also discloses a mount for a gauge cutter of a type which includes a mounting socket formed in a radially outer end standard. Such socket is arranged to receive an end portion of the cutter support shaft or pin, with the opposite end of such shaft or pin being secured to the other end standard by means of the clamps.
  • the principal object of this invention is to provide a 'novel mounting structure for a rock cutter wheel adapted to shorten the axial dimension of the cutter assembly.
  • the rock cutter wheel is supported for rotation about an elongated support shaft.
  • Such shaft is interconnected between a pair of side caps which serve as mounts, retainers for the bearings, and help define seal chambers at the opposite sides of the cutter wheel.
  • These side caps have base portions which are received within recesses formed in a pair of spaced apart end members. The exposed portions of the side caps located outwardly of the recesses are narrower than the base portions. Retainer members connected to the end members overhang the recesses to contact and bear against the base portions of the side caps.
  • the recesses and the base portions of the side caps are semicircular in shape.
  • the exposed portions of the side caps are also semicircular in shape but of a smaller diameter, resulting in the formation of shoulders where the base and exposed portions meet.
  • the retainer members on one end of the recess are removable so that the cutter subassembly (the cutter wheel, the support shaft, the side caps, etc.) can be inserted into or removed from the recesses while the opposite end retainer members are still secured to the end members.
  • FIG. 1 is an isometric view of a cutter assembly incor porating the present invention, taken from above and looking toward one side and one end of the assembly, and showing one of the retainer members in spaced relationship to its assembled position;
  • FIG. 2 is an end elevational view of the cutter assemy
  • FIG. 3 is a side elevational view of the cutter assemy
  • FIG. 4 is a top plan view of the cutter assembly
  • FIG. 5 is an axial sectional view taken through the cutter assembly.
  • the illustrated embodiment of cutter assembly comprises a mounting frame 10 adapted to support a cutter wheel subassembly 112 on a cutter carrier 14 (e.g. the cutterhead of a tunneling machine).
  • a cutter carrier 14 e.g. the cutterhead of a tunneling machine.
  • the direction of travel of the cutter wheel will be used for determining directional terminology. That is to say, the end members I6, 18 are the portions of the frame 10 which move along the path of the cutter assembly.
  • the side members 20, 22 are directed laterally of the path of travel.
  • Semicircular recesses 24, 26 are formed in the side members 20, 22.
  • the centers of curvature of the recesses 24, 26 lie on a line which coincides with the axis of rotation x.
  • Retainer member shelves 28 are provided adjacent the recesses 24, 26 at one end of the frame 10.
  • Like shelves 30 are provided adjacent the recesses at the opposite end of the frame 10.
  • the cutter wheel subassembly comprises a pair of side caps 32, 34 having base portions 36, 38 sized to be snugly received within the recesses 24. 26.
  • These side caps 32, 34 also include exposed portions 40, 42 which extend outwardly beyond the recesses 24, 26. Owing to this difference in radius between the base and exposed portions of the side caps, radial surfaces or shoulders 44, 46 exist on the base portion where the base portions meets the exposed portions. As best shown by FIGS. 1-3, when the side caps 32, 34 are located within the recesses 24, 26 the surfaces 44, 46 are in coplanar parallelism with the surfaces 28. 30. Retainer members 48, 50 are mounted on the shelves 28. 30.
  • retainer members 48, 50 include inwardly projecting portions 52, 54 which overhang the recesses and which contact and bear against the surfaces 44, 46 of the side caps 32, 34.
  • exposed portion is used herein to mean that portion of each side cap which is not snugly housed within a recess 24, 26, but rather projects outwardly from the recess. A narrower meaning of the word exposed" is not intended.
  • the retainer members 48, 50 are shown to be removably secured to the frame 10 by means of machine bolts 56.
  • either the retainer members 48 or the retainer members 50 may be integral portions of the frame 10.
  • Such arrangement is permissible because the difference in radius between the base and exposed portions of the side caps 32, 34 makes it possible to move the side caps 32, 34 into or out from the recesses 24, 26 with only one pair of the retainer members 48, 50 removed.
  • the cutter subassembly I2 is merely rotated to place the smaller radius portions 40, 42 of the side caps 32, 34 adjacent the installed retainer members 48, 50 during movement of the cutter subassembly 12 into or out from the recesses 24, 26.
  • coaxial openings 58, 60 are provided in the side caps 32, 34. These openings 58, 60 are sized to snugly receive a central mounting shaft or pin 62 for the cutter wheel.
  • One end of the shaft 62 is provided with an enlarged diameter head portion 64 which fits into a countersink 66 formed in the side cap 32.
  • a removable plate 68 is secured to the opposite end of shaft 62 by means of a plurality of bolts 70. Plate 68 extends into a countersink 72 formed in side cap 34.
  • a pair of combination bearings 74 are mounted on the shaft 62 between the side caps 32, 34. As shown by FIG.
  • these bearings 74 may each comprise a relatively fixed inner race, a rotating outer race and a plurality of tapered roller elements located between such races.
  • the cutter wheel itself may comprise an annular rim 76 having an internal spacer rib 78 which is disposed between the two outer races of the bearings. Rim 76 supports a replaceable cutter ring or tire" 80 which may be secured in place by a retainer ring 82.
  • a seal chamber is provided on each side of the cutter wheel preferably to receive radial face seals of the type disclosed by the aforementioned U. S. Pat. No. 3,216,513. These seals each comprise a rotating metal ring 84 and a relatively fixed metal ring 86. The two rings 84, 86 make contact within a radial face and are urged together by elastomeric rings 88 which resiliently back each of the rings 84, 86.
  • the seal chambers are formed partially by recesses within the cutter wheel rim 76 and partially by annular grooves formed within the side caps 32, 34.
  • the side caps 32, 34 are provided with central portions which bear axially against the inner or fixed races of the bearings 74.
  • the seal chambers are formed radially outwardly of these inner portions of the side caps 32, 34.
  • Axial ports closable by plugs 90 may be provided in the side caps 32, 34 to provide avenues through which a suitable lubricant can be introduced into the region of the bearings 74.
  • complementary semi-circular grooves are formed in the outer periphery of the base portion 36 and the recess 24, to receive a semicircular key 92.
  • This key 92 serves to lock the side cap 32 in place axially (and hence the entire subassembly) but does not inhibit removal of the cutter wheel subassembly from the mounting frame 10.
  • the base portions 36, 38 of the side caps 32, 34 may I be about equal in thickness to the side members 20, 22
  • FIG. 1 The exposed portions of the end caps and the like diameter inner parts of the base portions are shown to be thinner than the side members 20, 22, and to be recessed relative to the outer faces of such side members 20, 22 (FIG. 1).
  • the ends of the shaft 62 are preferably also inset from the outer faces of the side members 20, 22.
  • a mounting structure for an earth formation cutter wheel comprising:
  • each said side member including a mounting recess
  • each said side cap including a base portion sized to snugly fit within the recess of its side member, and a narrower exposed portion, said base portion including a shoulder where it stops and the narrower exposed portion begins;
  • retainer members secured to said side members and overhanging said recesses to contact and bear against the shoulders of the base portions of said side caps, with at least some of said retainer members being detachable from said side members so that they can be removed to permit installation of said side caps into, or removal of said side caps out from, said recesses.
  • Mounting structure according to claim I further including complementary key grooves formed in the base portion of a side cap and in its recess, and a key insertable into said grooves, to restrain said side cap against axial movement.
  • each side cap is formed to include an axially inwardly opening circumferential groove forming at least a portion of a seal chamber.
  • a cutter wheel assembly for use in mining earth formations, comprising:
  • each said side member including a mounting recess
  • each said side cap including a base portion sized to snugly fit within the recess of its side member, and a narrower exposed portion, said base portion including a shoulder where it stops and the narrower exposed portion begins;
  • retainer members secured to said side members and over-hanging said recesses to contact and bear against the shoulders of the base portions of said side caps, with at least some of said retainer members being detachable from said side members so that they can be removed to permit installation of said side caps into, or removal of said side caps out from said recesses.
  • a cutter wheel assembly wherein said means supporting the cutter wheel for rotation about said support shaft includes bearing means, and wherein said side caps include axially inwardly opening annular grooves which help define a seal chamber between each side cap and an adjacent portion of the cutter wheel, and a rotary-to-nonrotary seal is located within each seal chamber.
  • a cutter wheel assembly according to claim 8, wherein the said recesses and the base portions of the side caps are semicircular in shape, and the exposed portions of the side caps are also semicircular in shape but of a smaller radius, resulting in the formation of a generally radial shoulder at the boundary between the said base and exposed portions of said side caps, with the distance between the inner radial boundaries of the two retainer members of each .side member being greater than the diameter of the exposed portion of the side caps supported by such side member.
  • a cutter wheel assembly according to claim 9 wherein complementary semicircular key grooves are formed in the base portion of a side cap and in its recess, and a semicircular key is insertable into the key grooves for restraining the side cap against axial move-

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
US00249364A 1972-05-01 1972-05-01 Rock cutter assembly Expired - Lifetime US3787101A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US24936472A 1972-05-01 1972-05-01

Publications (1)

Publication Number Publication Date
US3787101A true US3787101A (en) 1974-01-22

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US00249364A Expired - Lifetime US3787101A (en) 1972-05-01 1972-05-01 Rock cutter assembly

Country Status (11)

Country Link
US (1) US3787101A (ja)
JP (1) JPS5325281B2 (ja)
AU (1) AU461945B2 (ja)
CA (1) CA965807A (ja)
CH (1) CH561594A5 (ja)
DE (1) DE2321830A1 (ja)
FR (1) FR2183003B1 (ja)
IT (1) IT982999B (ja)
SE (1) SE403815B (ja)
ZA (1) ZA731402B (ja)
ZM (1) ZM7073A1 (ja)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884312A (en) * 1973-09-12 1975-05-20 Robbins Co Rock cutter assemblies
WO1979001010A1 (en) * 1978-05-01 1979-11-29 Robbins Co Roller cutter mount for an earth boring cutterhead
US4193637A (en) * 1978-08-07 1980-03-18 The Robbins Company Rotary cutterhead for an earth boring machine
USRE31511E (en) 1978-08-07 1984-01-31 The Robbins Company Rotary cutterhead for an earth boring machine
US4454923A (en) * 1981-08-17 1984-06-19 Wirth Maschinen-Und Bohrgerate-Fabrik Gmbh Holding device for boring head tools or the like
WO1985002653A1 (en) * 1983-12-06 1985-06-20 The Robbins Company Mobile mining machine and method
US4760890A (en) * 1987-05-18 1988-08-02 Tamrock Inc. Cutter assembly for rotary boring of earth
US5181577A (en) * 1989-09-25 1993-01-26 Kabushiki Kaisha Komatsu Seisakusho Device for fixing disk cutter to tunnel excavator
US5577565A (en) * 1995-06-29 1996-11-26 Boretec, Inc. Compact roller cutter
US20080282584A1 (en) * 2007-05-14 2008-11-20 Hall David R Rolling Assembly Mounted on a Trencher
US20090079256A1 (en) * 2007-09-25 2009-03-26 Caterpillar Inc. Rotary cutter for tunnel boring machine
US20100107455A1 (en) * 2007-05-14 2010-05-06 Hall David R Skewed Roller on an Excavator
US20100155050A1 (en) * 2008-12-23 2010-06-24 Frazier W Lynn Down hole tool
US20100263876A1 (en) * 2009-04-21 2010-10-21 Frazier W Lynn Combination down hole tool
US8459346B2 (en) 2008-12-23 2013-06-11 Magnum Oil Tools International Ltd Bottom set downhole plug
USD694281S1 (en) 2011-07-29 2013-11-26 W. Lynn Frazier Lower set insert with a lower ball seat for a downhole plug
USD694280S1 (en) 2011-07-29 2013-11-26 W. Lynn Frazier Configurable insert for a downhole plug
USD698370S1 (en) 2011-07-29 2014-01-28 W. Lynn Frazier Lower set caged ball insert for a downhole plug
USD703713S1 (en) 2011-07-29 2014-04-29 W. Lynn Frazier Configurable caged ball insert for a downhole tool
US8899317B2 (en) 2008-12-23 2014-12-02 W. Lynn Frazier Decomposable pumpdown ball for downhole plugs
US9062522B2 (en) 2009-04-21 2015-06-23 W. Lynn Frazier Configurable inserts for downhole plugs
US9109428B2 (en) 2009-04-21 2015-08-18 W. Lynn Frazier Configurable bridge plugs and methods for using same
US9127527B2 (en) 2009-04-21 2015-09-08 W. Lynn Frazier Decomposable impediments for downhole tools and methods for using same
US9163477B2 (en) 2009-04-21 2015-10-20 W. Lynn Frazier Configurable downhole tools and methods for using same
US9181772B2 (en) 2009-04-21 2015-11-10 W. Lynn Frazier Decomposable impediments for downhole plugs
US9217319B2 (en) 2012-05-18 2015-12-22 Frazier Technologies, L.L.C. High-molecular-weight polyglycolides for hydrocarbon recovery
US9506309B2 (en) 2008-12-23 2016-11-29 Frazier Ball Invention, LLC Downhole tools having non-toxic degradable elements
US9562415B2 (en) 2009-04-21 2017-02-07 Magnum Oil Tools International, Ltd. Configurable inserts for downhole plugs
US9587475B2 (en) 2008-12-23 2017-03-07 Frazier Ball Invention, LLC Downhole tools having non-toxic degradable elements and their methods of use
US9611698B2 (en) 2011-09-16 2017-04-04 Vermeer Manufacturing Company Hole opener bearing arrangement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3933168A1 (de) * 1988-10-14 1990-04-19 Bauer Spezialtiefbau Schlitzwandfraese
WO1999018326A1 (en) 1997-10-06 1999-04-15 Excavation Engineering Associates, Inc. Small disc cutters, and drill bits, cutterheads, and tunnel boring machines employing such rolling disc cutters

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3216513A (en) * 1964-01-06 1965-11-09 Robbins & Assoc James S Cutter assemblies for rock drilling
US3389760A (en) * 1966-09-01 1968-06-25 Hughes Tool Co Rolling cutters for rock formations mounted on simple beam bearings
US3449024A (en) * 1965-03-08 1969-06-10 Dresser Ind Seal arrangement between relatively rotatable members
US3601207A (en) * 1969-05-19 1971-08-24 Lawrence Mfg Co Cutter assembly
US3612196A (en) * 1970-05-01 1971-10-12 Smith International Rock-boring cutter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3216513A (en) * 1964-01-06 1965-11-09 Robbins & Assoc James S Cutter assemblies for rock drilling
US3449024A (en) * 1965-03-08 1969-06-10 Dresser Ind Seal arrangement between relatively rotatable members
US3389760A (en) * 1966-09-01 1968-06-25 Hughes Tool Co Rolling cutters for rock formations mounted on simple beam bearings
US3601207A (en) * 1969-05-19 1971-08-24 Lawrence Mfg Co Cutter assembly
US3612196A (en) * 1970-05-01 1971-10-12 Smith International Rock-boring cutter

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884312A (en) * 1973-09-12 1975-05-20 Robbins Co Rock cutter assemblies
WO1979001010A1 (en) * 1978-05-01 1979-11-29 Robbins Co Roller cutter mount for an earth boring cutterhead
US4202418A (en) * 1978-05-01 1980-05-13 The Robbins Company Roller cutter mounts
US4193637A (en) * 1978-08-07 1980-03-18 The Robbins Company Rotary cutterhead for an earth boring machine
USRE31511E (en) 1978-08-07 1984-01-31 The Robbins Company Rotary cutterhead for an earth boring machine
US4454923A (en) * 1981-08-17 1984-06-19 Wirth Maschinen-Und Bohrgerate-Fabrik Gmbh Holding device for boring head tools or the like
WO1985002653A1 (en) * 1983-12-06 1985-06-20 The Robbins Company Mobile mining machine and method
US4548442A (en) * 1983-12-06 1985-10-22 The Robbins Company Mobile mining machine and method
US4760890A (en) * 1987-05-18 1988-08-02 Tamrock Inc. Cutter assembly for rotary boring of earth
US5181577A (en) * 1989-09-25 1993-01-26 Kabushiki Kaisha Komatsu Seisakusho Device for fixing disk cutter to tunnel excavator
US5577565A (en) * 1995-06-29 1996-11-26 Boretec, Inc. Compact roller cutter
US20080282584A1 (en) * 2007-05-14 2008-11-20 Hall David R Rolling Assembly Mounted on a Trencher
US7950170B2 (en) 2007-05-14 2011-05-31 Hall David R Skewed roller on an excavator
US7690138B2 (en) * 2007-05-14 2010-04-06 Hall David R Rolling assembly mounted on a trencher
US20100107455A1 (en) * 2007-05-14 2010-05-06 Hall David R Skewed Roller on an Excavator
US7997659B2 (en) 2007-09-25 2011-08-16 Caterpillar Inc. Rotary cutter for tunnel boring machine
US20090079256A1 (en) * 2007-09-25 2009-03-26 Caterpillar Inc. Rotary cutter for tunnel boring machine
USD697088S1 (en) 2008-12-23 2014-01-07 W. Lynn Frazier Lower set insert for a downhole plug for use in a wellbore
US8899317B2 (en) 2008-12-23 2014-12-02 W. Lynn Frazier Decomposable pumpdown ball for downhole plugs
US8459346B2 (en) 2008-12-23 2013-06-11 Magnum Oil Tools International Ltd Bottom set downhole plug
US8496052B2 (en) 2008-12-23 2013-07-30 Magnum Oil Tools International, Ltd. Bottom set down hole tool
US9309744B2 (en) 2008-12-23 2016-04-12 Magnum Oil Tools International, Ltd. Bottom set downhole plug
US9587475B2 (en) 2008-12-23 2017-03-07 Frazier Ball Invention, LLC Downhole tools having non-toxic degradable elements and their methods of use
US20100155050A1 (en) * 2008-12-23 2010-06-24 Frazier W Lynn Down hole tool
USD694282S1 (en) 2008-12-23 2013-11-26 W. Lynn Frazier Lower set insert for a downhole plug for use in a wellbore
US9506309B2 (en) 2008-12-23 2016-11-29 Frazier Ball Invention, LLC Downhole tools having non-toxic degradable elements
US20100263876A1 (en) * 2009-04-21 2010-10-21 Frazier W Lynn Combination down hole tool
US9562415B2 (en) 2009-04-21 2017-02-07 Magnum Oil Tools International, Ltd. Configurable inserts for downhole plugs
US9062522B2 (en) 2009-04-21 2015-06-23 W. Lynn Frazier Configurable inserts for downhole plugs
US9109428B2 (en) 2009-04-21 2015-08-18 W. Lynn Frazier Configurable bridge plugs and methods for using same
US9127527B2 (en) 2009-04-21 2015-09-08 W. Lynn Frazier Decomposable impediments for downhole tools and methods for using same
US9163477B2 (en) 2009-04-21 2015-10-20 W. Lynn Frazier Configurable downhole tools and methods for using same
US9181772B2 (en) 2009-04-21 2015-11-10 W. Lynn Frazier Decomposable impediments for downhole plugs
USD694281S1 (en) 2011-07-29 2013-11-26 W. Lynn Frazier Lower set insert with a lower ball seat for a downhole plug
USD703713S1 (en) 2011-07-29 2014-04-29 W. Lynn Frazier Configurable caged ball insert for a downhole tool
USD698370S1 (en) 2011-07-29 2014-01-28 W. Lynn Frazier Lower set caged ball insert for a downhole plug
USD694280S1 (en) 2011-07-29 2013-11-26 W. Lynn Frazier Configurable insert for a downhole plug
US9611698B2 (en) 2011-09-16 2017-04-04 Vermeer Manufacturing Company Hole opener bearing arrangement
US9217319B2 (en) 2012-05-18 2015-12-22 Frazier Technologies, L.L.C. High-molecular-weight polyglycolides for hydrocarbon recovery

Also Published As

Publication number Publication date
JPS4921903A (ja) 1974-02-26
ZA731402B (en) 1973-11-28
SE403815B (sv) 1978-09-04
JPS5325281B2 (ja) 1978-07-26
ZM7073A1 (en) 1974-02-21
AU5257873A (en) 1974-08-29
FR2183003A1 (ja) 1973-12-14
CA965807A (en) 1975-04-08
FR2183003B1 (ja) 1976-04-23
CH561594A5 (ja) 1975-05-15
IT982999B (it) 1974-10-21
AU461945B2 (en) 1975-06-12
DE2321830A1 (de) 1973-11-15

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