US3344914A - Mixing capsule - Google Patents

Mixing capsule Download PDF

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Publication number
US3344914A
US3344914A US497891A US49789165A US3344914A US 3344914 A US3344914 A US 3344914A US 497891 A US497891 A US 497891A US 49789165 A US49789165 A US 49789165A US 3344914 A US3344914 A US 3344914A
Authority
US
United States
Prior art keywords
body member
diaphragm
capsule
mixing
open end
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
US497891A
Other languages
English (en)
Inventor
Stefan A Bloom
Denholtz Melvin
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.)
Dental Design Systems
Original Assignee
Dental Design Systems
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 Dental Design Systems filed Critical Dental Design Systems
Priority to US497891A priority Critical patent/US3344914A/en
Priority to GB44902/66A priority patent/GB1103969A/en
Priority to SE13961/66A priority patent/SE318058B/xx
Priority to FI662713A priority patent/FI48662C/fi
Priority to ES0332299A priority patent/ES332299A1/es
Priority to CH1498166A priority patent/CH462381A/de
Priority to NO165191A priority patent/NO123298B/no
Priority to NL6614667A priority patent/NL6614667A/xx
Priority to DE19661632443 priority patent/DE1632443C/de
Priority to DK541066AA priority patent/DK130571B/da
Priority to BE688525D priority patent/BE688525A/xx
Application granted granted Critical
Publication of US3344914A publication Critical patent/US3344914A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C13/00—Portable extinguishers which are permanently pressurised or pressurised immediately before use
    • A62C13/003—Extinguishers with spraying and projection of extinguishing agents by pressurised gas
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C5/00—Filling or capping teeth
    • A61C5/60—Devices specially adapted for pressing or mixing capping or filling materials, e.g. amalgam presses
    • A61C5/66—Capsules for filling material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/32—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging two or more different materials which must be maintained separate prior to use in admixture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S215/00—Bottles and jars
    • Y10S215/08—Mixing

Definitions

  • This invention relates to a capsule for mixing quantities of complementary materials, for example (and without limitation thereto) such as an amalgam of silver powder and mercury for use by dentists, and other liquids, powders, and mixtures which must remain separate until shortly before use.
  • complementary materials for example (and without limitation thereto) such as an amalgam of silver powder and mercury for use by dentists, and other liquids, powders, and mixtures which must remain separate until shortly before use.
  • the invention provides a mixing capsule having first and second body members which may be prefilled, in initial manufacture by the manufacturer, with precisely the small quantities of the materials to be mixed, and then the parts assembled to maintain said materials separate and in sealed relation until the time of use, when the caspule is activated, mixing said materials.
  • the invention provides a novel, simple and effective means for preparing and mixing materials, eliminating the need for measuring separate quantities and for clean containers, and avoiding waste such as inherent heretofore in preparation of materials of small quantities, due to the difliculties in measurement and resultant inaccuracy and inefliciency.
  • the invention accomplishes the foregoing and other objectives by the use of two capsule halves or body members which may be provided with premeasured quantities of the materials to be mixed, separated by a thin diaphragm, preventing reaction therebetween until the capsule isactivated.
  • the invention further contemplates novel means for maintaining a sealing diaphragm in the capsule until it is desired to activate the capsule, and novel means for facilitating rupturing and separation of the diaphragm to open the interiors of the body members for mixture of the contents.
  • the capsule of this invention is designed to enable acti vation to be achieved in a positive and effective fashion, eliminating risk of error in use.
  • the invention further provides novel means for maintaining capsule half parts sealed so as to isolate the respective materials contained therein until the time of use, and thereupon isolating the mixed materials until it is desired to open the capsule for use thereof.
  • FIG. 1 is the longitudinal sectional view of a mixing capsule embodying our invention, shown Prior to compression,
  • FIG. 2 is a similar view thereof on compression
  • FIG. 3 is a fragmentary, perspective view of the lower portion of the first body member of the invention.
  • FIGS. 4A through 4D are perspective views of a mixing capsule according to the invention in various stages of compression
  • FIG. 5 is a perspective view of the mixing capsule of FIG. 4D after separation
  • FIG. 6 is a fragmentary, perspective view of the lower portion of the first body member in FIG.
  • a mixing capsule embodying the invention is shown to comprise a first body member 10 and a second body member 11, proportioned to slidably receive the first body member therein.
  • said fifil i Patented Get. 3, 1967 body members may be formed as elongated members open at one end, and closed at the other end, assembled by the insertion of the open end of one member (10, FIG. 1) into the other.
  • the capsule may be made of any materials desired, such as plastic or other materials and of tubular or other form.
  • Each of the members 10, 11 is adapted to be filled by the manufacturer with the predetermined, precise quantity of materials to be mixed. Novel means are provided for separation of said materials, while, at the same time, sealing the capsule.
  • a diaphragm 12 is formed unitary with, or secured to, a cup-shaped member 13, which, in turn, is secured to the free end of the second body member by a marginal retention flange or the like, 14.
  • the contents of the first body member or of the cup are isolated from the contents of the second body member on initial manufacture and up to the time of actual use of the capsule, at which time, on movement of body member 10 into second body member 11, the diaphragm 12 will be punctured.
  • the parts are so proportioned that, on occurrence of the puncturing operation, the diaphragm 12 will be moved to a position intermediate the walls' of the first and second body members 10, 11 (FIG. 2). To that end as shown more clearly in FIG.
  • the free end 16 of the first body member may be formed at an angle to the longitudinal axis thereof and charnfered as noted at 17 except for a dull edged portion 18.
  • the cutting edge 16 will puncture'the diaphragm 12 and the latter will (as above noted) he moved to a position adjacent the interior of the second body member and intermediate the walls of the first and second body member (FIG. 2).
  • a circumferential flange 19 on first body member 10 initially engages the inner walls of the cup member 13, and, upon activating the capsule (FIG. 2) engages a complementary stop portion such as chamfered edge 20 formed interiorly of the second body member 11.
  • the circumferential edge 19 serves as a sealing means.
  • Each of the body members may be formed with spherical closed ends, and with knurled diameters, as noted at 21, 22 for facility of handling of the parts.
  • FIGS. 4A through 4D show a mixing capsule according to the invention in various stages of compression.
  • a toe portion at the free end of the first body member 10 is in the vicinity of the diaphragm 12 of the cup member 13.
  • the toe portion includes a piercing point 16-1.
  • a bowl portion 11-1 of the second body member 11 contains one of the materials to be mixed, e.g., silver powder (not shown).
  • the first body member 10 is filled with the other material to be mixed, e.g., mercury (not shown) which, after assembly of the mixing capsule, is disposed in the cap 13.
  • the sealing flange 19 of the mixing capsule in FIG. 1 has been moved upward along the shank of the first body member 10 forming a sealing flange 19-1.
  • the sealing flange 19-1 is positioned to assist separation of the capsule components in the manner described subsequently once mixing is completed.
  • the free end of the first body member 10 desirably includes a second sealing flange 19-2 which passes in the vicinity of the piercing point 16-1 and encircles the free end.
  • the first body member 10 is advantageously constructed with a dulled portion 18 near its heel, but with a relatively sharp cutting edge in the vicinity of its piercing point 16-1.
  • the first and second body members 10 and 11 are cylindrical with the cup member 13 being snugly inserted into the second body member 11 and the first body member being snugly inserted into the cup member 13.
  • the first body member 10 moves slideably with respect to the second body member 11 within the cup 13.
  • the piercing point 16-1 at the toe of the first body member 10 engages the diaphragm 12, and begins to shear the diaphragm 12 as shown in FIG. 4B. The shearing effect takes place even if the piercing point 16-1 is omitted, but it is initiated with less compressional force by having the piercing point present.
  • the capsule adopts the configuration of FIG. 4C with the diaphragm 12 circumferentially sheared from the cup 13 except for a hinge region 12-1.
  • the presence of the hinge 121 is promoted by the dulled region 18 at the heel of the first body member 10.
  • the hinge 12-1 was present with the dulled portion 18 omitted from the first body member 10.
  • the diaphragm 12 When the diaphragm 12 has been sheared suificiently, e.g., as in FIG. 4C, the complementary material such as mercury originally placed in the first body member 10 falls into the bowl portion 11-1 of the second body member 11.
  • the hingeably sheared diaphragm '12 Upon further movement of the first body member 10 with respect to the second body member 11 the hingeably sheared diaphragm '12 is forced against the inner wall of the second body member, becomes trapped and adopts the contour of a gap or recess 11-2 between the inner and outer walls of the two body members, as shown in FIG. 4D.
  • the recess extends'from the open end of the second body member 11 to the vicinity of its closed end, where the inside diameter of the second body member is substantially the same as that of the first body member 10.
  • the ingredients to be mixed occupy the bowl portion 11-1. Thereafter the mixing can take place by shaking either manually or by machine. Because of the way in which the diaphragm 12 is trapped in the recess 11-2, it is unable to interfere with any subsequent shaking operation, In addition the engagement of the lower portion of the first body member 10 with the bowl portion 11-1 of the second body member 11 produces a unitary mixing chamber which forestalls the loss, in the recess 11-2, of any of the materials being mixed. It is to be noted that even where the capsule is only partially compressed, the membrane or diaphragm 12 becomes trapped and unable to interfere with any subsequent shaking operation.
  • the mixing capsule In addition to producing a unitary chamber, full compression of the mixing capsule causes the upper flange 19-1 to engage the base of the cup member 13 from which the membrane or diaphragm has been sheared. This facilitates the separation of the components of capsule in the fashion of FIG. once the shaking operation is completed and the constituent materials have been thoroughly mixed. In the case of a capsule designed for partial compression, the flange 19-1 is disposed accordingly.
  • the principal components of the mixing capsule can be separated by grasping the knurled portions 21 and 22 and withdrawing the first body member from the second. As shown in FIG. 5, the cup and diaphragm can be Withdrawn from the second body member 11 as a unit.
  • a mixing capsule comprising:
  • a first elongated body member open at one end and closed at the other end;
  • a second elongated body member open at one end, closed at the other end and proportioned to receive the first body member with a gap between respective inner and outer walls of the two body members;
  • each of said body members being adapted to receive a quantity of material for mixing
  • cup member open at one end and closed at the other end by a frangible, transversely extending diap g said cup member receiving, at its open end, the open end of said first body member and being secured to said second body member, filling said gap, at the open end of said second body member with said diaphragm transversely disposed therein;
  • the open end of said first body member being proportioned to break said diaphragm and trap the diaphragm thus broken in the gap below said cup member when said open end is moved from said cup member into said second body member thereby interiorly connecting said body members for the mixing of materials therein.
  • a mixing capsule as defined in claim 1 further including a circumferential flange upon said first body member.
  • a mixing capsule as defined in claim 1 further including a sealing flange on said first body member for facilitating the withdrawal from said second body member of said first body member intact with said cup member.
  • a mixing capsule comprising:
  • an elongated body member for containing a first substance and having an interior recess extending from a closed end to an open end;
  • Another elongated body member closed at one end, for containing a second substance and having an open end inserted into the first mentioned body member above said membrane;
  • a mixing capsule as defined in claim wherein said flexible membrane is of plastic and the open end of said second mentioned body member is proportioned to hingeably shear said membrane.
  • a mixing capsule as defined in claim 10 further including means on said second mentioned body member for facilitating the withdrawal, from said first mentioned body member, of said second mentioned body member, said cup member and said sheared membrane as a complete unit.
  • a mixing capsule comprising:
  • a first cylindrical body member closed at one end and open at the other end;
  • a second cylindrical body member closed at one end and open at the other end, the inside diameter of said second body member being (1) smaller in the vicinity of its closed end than in the vicinity of its open end and being (2) substantially equal, near said closed end, to the outside diameter of said first body member in the vicinity of the open end thereof;
  • cup member open at one end and closed at the other end by a flexible and frangible plastic diaphragm, the closed end of said cup member being snugly inserted into the open end of said second body member;
  • the open end of said first body member being snugly inserted into the open end of said cup member and including means for (1) shearing the diaphragm of said cup member and (2) trapping the diaphragm thus sheared in the region between the inside diameter of said first body member and the outside diameter of said second body member.
  • the wall thickness of said cup member is greater than the thickness of said diaphragm
  • the open end of said first body member is formed at an angle with respect to the longitudinal axis thereof and chamfered to form a cutting edge for shearing said diaphragm;
US497891A 1965-10-19 1965-10-19 Mixing capsule Expired - Lifetime US3344914A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US497891A US3344914A (en) 1965-10-19 1965-10-19 Mixing capsule
GB44902/66A GB1103969A (en) 1965-10-19 1966-10-07 Mixing capsule
SE13961/66A SE318058B (no) 1965-10-19 1966-10-14
FI662713A FI48662C (fi) 1965-10-19 1966-10-14 Sekoituskapseli.
ES0332299A ES332299A1 (es) 1965-10-19 1966-10-15 Un dispositivo de capsula mezcladora.
CH1498166A CH462381A (de) 1965-10-19 1966-10-17 Mischkapsel
NO165191A NO123298B (no) 1965-10-19 1966-10-18
NL6614667A NL6614667A (no) 1965-10-19 1966-10-18
DE19661632443 DE1632443C (de) 1965-10-19 1966-10-19 Mischkapsel
DK541066AA DK130571B (da) 1965-10-19 1966-10-19 Blandebeholder, især til tandplomberingsmateriale.
BE688525D BE688525A (no) 1965-10-19 1966-10-19

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US497891A US3344914A (en) 1965-10-19 1965-10-19 Mixing capsule

Publications (1)

Publication Number Publication Date
US3344914A true US3344914A (en) 1967-10-03

Family

ID=23978747

Family Applications (1)

Application Number Title Priority Date Filing Date
US497891A Expired - Lifetime US3344914A (en) 1965-10-19 1965-10-19 Mixing capsule

Country Status (10)

Country Link
US (1) US3344914A (no)
BE (1) BE688525A (no)
CH (1) CH462381A (no)
DK (1) DK130571B (no)
ES (1) ES332299A1 (no)
FI (1) FI48662C (no)
GB (1) GB1103969A (no)
NL (1) NL6614667A (no)
NO (1) NO123298B (no)
SE (1) SE318058B (no)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3404723A (en) * 1966-02-25 1968-10-08 Eugene W. Lewis Method for producing dental molds or molding material
US3451540A (en) * 1967-12-12 1969-06-24 Pennsalt Chemicals Corp Disposable mixing capsule
US3476181A (en) * 1967-11-24 1969-11-04 Dentek Inc Dental ingredient capsule
US3497320A (en) * 1966-12-15 1970-02-24 Xerox Corp Automated chemical analyzer
US3521745A (en) * 1968-07-31 1970-07-28 Gilbert Schwartzman Mixing package
DE1955996A1 (de) * 1969-11-07 1971-05-19 Marckardt Volker Mehrkammeriger Behaelter zur getrennten Aufnahme von miteinander reagierender Substanzen fuer die Herstellung gebrauchsfertiger Dentalpraeparate
US3595439A (en) * 1969-09-09 1971-07-27 Minnesota Mining & Mfg Combination mixing capsule and dispenser
US3638918A (en) * 1970-03-09 1972-02-01 Dental Design Systems Mixing of substances
DE2412410A1 (de) * 1974-03-15 1975-09-25 Compakta Werke Baustoff Gmbh Kartusche zur aufnahme einer zweikomponenten-dichtungsmasse
US3917062A (en) * 1974-11-01 1975-11-04 Sterndent Corp Mixing container for dental materials
US4167228A (en) * 1976-05-05 1979-09-11 Cheetham J J Containers
US4483439A (en) * 1981-03-14 1984-11-20 Wella Aktiengesellschaft Two-component packaging for pourable media
US4515267A (en) * 1983-11-16 1985-05-07 Dentsply Research & Development Corp. Dental mixing and extrusion capsule
US4533640A (en) * 1984-02-21 1985-08-06 Shafer Jules A Accumulated thermal exposure responder and method of use
US4615437A (en) * 1984-07-20 1986-10-07 Robert Finke Kommanditgesellschaft Bottle closure with separable capsule
DE9206892U1 (no) * 1992-05-21 1992-12-03 Ihde, Stefan, Prof.Dr., Uetliburg, Ch
US5396986A (en) * 1993-06-16 1995-03-14 Special Metals Corporation Mixing capsule having three tubular members
US5685422A (en) * 1994-03-22 1997-11-11 Georg Wiegner Two-component mixing package
US5769215A (en) * 1994-03-22 1998-06-23 Georg Wiegner Two-component package
US6360886B1 (en) 2000-03-13 2002-03-26 Kerr Corporation Capsule for use in preparing a dental amalgam
US20090250358A1 (en) * 2008-04-08 2009-10-08 Dana Karklins Portion-Controlled Dispensing Straw Assembly
US20100213158A1 (en) * 2007-10-17 2010-08-26 Sang-Hoon Kim Bottle cap having a first cap member and a second cap member assembled thereto

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2169445A6 (no) * 1971-03-15 1973-09-07 Oreal
DE2724519C2 (de) * 1976-09-01 1987-08-20 Henkel KGaA, 4000 Düsseldorf Zweikomponentenverpackung
SE444639B (sv) * 1978-08-02 1986-04-28 Johnson & Johnson Engangskapsel for dentalamalgam
DE3823708C2 (de) * 1988-07-13 1994-04-14 Atlas Copco Elektrowerkzeuge Motorisch angetriebene Einrichtung zum Dosieren und Mischen von wenigstens zwei Substanzen
DK235589D0 (da) * 1989-05-12 1989-05-12 Wolff & Kaaber Fremgangsmaade og indretning til blanding af en fast og en flydende komponent
GB2270293A (en) * 1992-09-05 1994-03-09 Medix Ltd Drug dispensing system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2527992A (en) * 1947-11-21 1950-10-31 Alvin A Greenberg Capsule
US2721552A (en) * 1954-03-29 1955-10-25 Nosik William Andre Multiple chamber container

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2527992A (en) * 1947-11-21 1950-10-31 Alvin A Greenberg Capsule
US2721552A (en) * 1954-03-29 1955-10-25 Nosik William Andre Multiple chamber container

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3404723A (en) * 1966-02-25 1968-10-08 Eugene W. Lewis Method for producing dental molds or molding material
US3497320A (en) * 1966-12-15 1970-02-24 Xerox Corp Automated chemical analyzer
US3504376A (en) * 1966-12-15 1970-03-31 Xerox Corp Automated chemical analyzer
US3476181A (en) * 1967-11-24 1969-11-04 Dentek Inc Dental ingredient capsule
US3451540A (en) * 1967-12-12 1969-06-24 Pennsalt Chemicals Corp Disposable mixing capsule
US3521745A (en) * 1968-07-31 1970-07-28 Gilbert Schwartzman Mixing package
US3595439A (en) * 1969-09-09 1971-07-27 Minnesota Mining & Mfg Combination mixing capsule and dispenser
DE1955996A1 (de) * 1969-11-07 1971-05-19 Marckardt Volker Mehrkammeriger Behaelter zur getrennten Aufnahme von miteinander reagierender Substanzen fuer die Herstellung gebrauchsfertiger Dentalpraeparate
US3638918A (en) * 1970-03-09 1972-02-01 Dental Design Systems Mixing of substances
DE2412410A1 (de) * 1974-03-15 1975-09-25 Compakta Werke Baustoff Gmbh Kartusche zur aufnahme einer zweikomponenten-dichtungsmasse
US3917062A (en) * 1974-11-01 1975-11-04 Sterndent Corp Mixing container for dental materials
US4294351A (en) * 1976-05-05 1981-10-13 Cheetham J J Containers
US4167228A (en) * 1976-05-05 1979-09-11 Cheetham J J Containers
US4483439A (en) * 1981-03-14 1984-11-20 Wella Aktiengesellschaft Two-component packaging for pourable media
US4515267A (en) * 1983-11-16 1985-05-07 Dentsply Research & Development Corp. Dental mixing and extrusion capsule
US4533640A (en) * 1984-02-21 1985-08-06 Shafer Jules A Accumulated thermal exposure responder and method of use
WO1985003775A1 (en) * 1984-02-21 1985-08-29 Controlled Chemicals Incorporated Accumulated thermal exposure responder and method of use
US4615437A (en) * 1984-07-20 1986-10-07 Robert Finke Kommanditgesellschaft Bottle closure with separable capsule
DE9206892U1 (no) * 1992-05-21 1992-12-03 Ihde, Stefan, Prof.Dr., Uetliburg, Ch
US5396986A (en) * 1993-06-16 1995-03-14 Special Metals Corporation Mixing capsule having three tubular members
US5685422A (en) * 1994-03-22 1997-11-11 Georg Wiegner Two-component mixing package
US5769215A (en) * 1994-03-22 1998-06-23 Georg Wiegner Two-component package
US6360886B1 (en) 2000-03-13 2002-03-26 Kerr Corporation Capsule for use in preparing a dental amalgam
US6439380B1 (en) 2000-03-13 2002-08-27 Kerr Corporation Capsule for use in preparing a dental amalgam
US20100213158A1 (en) * 2007-10-17 2010-08-26 Sang-Hoon Kim Bottle cap having a first cap member and a second cap member assembled thereto
US20090250358A1 (en) * 2008-04-08 2009-10-08 Dana Karklins Portion-Controlled Dispensing Straw Assembly
US7997509B2 (en) * 2008-04-08 2011-08-16 Dana Karklins Portion-controlled dispensing straw assembly

Also Published As

Publication number Publication date
CH462381A (de) 1968-09-15
DK130571C (no) 1975-08-11
NL6614667A (no) 1967-04-20
DE1632443B2 (de) 1972-06-29
NO123298B (no) 1971-10-25
GB1103969A (en) 1968-02-21
SE318058B (no) 1969-12-01
ES332299A1 (es) 1967-07-16
BE688525A (no) 1967-04-19
DE1632443A1 (de) 1972-01-27
DK130571B (da) 1975-03-10
FI48662B (no) 1974-09-02
FI48662C (fi) 1974-12-10

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