US3779414A - Anaesthetic supply - Google Patents

Anaesthetic supply Download PDF

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Publication number
US3779414A
US3779414A US00252114A US3779414DA US3779414A US 3779414 A US3779414 A US 3779414A US 00252114 A US00252114 A US 00252114A US 3779414D A US3779414D A US 3779414DA US 3779414 A US3779414 A US 3779414A
Authority
US
United States
Prior art keywords
bottle
cap
neck
axially
collar
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
US00252114A
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English (en)
Inventor
W Jones
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.)
Cyprane Ltd
Original Assignee
Cyprane Ltd
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 Cyprane Ltd filed Critical Cyprane Ltd
Application granted granted Critical
Publication of US3779414A publication Critical patent/US3779414A/en
Anticipated expiration legal-status Critical
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/14—Preparation of respiratory gases or vapours by mixing different fluids, one of them being in a liquid phase
    • A61M16/18—Vaporising devices for anaesthetic preparations
    • A61M16/183—Filling systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0311—Closure means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/02—Applications for medical applications

Definitions

  • a bottle and a connecting cap therefor, both components having mating screw threads, the components having a mating key and keyway system extending axially of the bottle neck and being designed so that mating of the key and keyway system is necessary before relative rotation between the cap and the bottle to screw the cap onto the bottle is possible.
  • the invention does not rely merely on different threads, but rather on a key and keyway system, fixing of the cap to the bottle only being possible if both key and keyway systems and threads engage. It will be evident that many different forms of keys and keyways can be provided by varying the number of keys and keyways, their sizes and their angular spacing, and all these forms may be used with one standard thread formation. If the number of possible combinations is not sufficient, then a similar range may be provided with a different thread, so that even if the wrong cap having engaging keys and keyways was selected the threads would not mate and the cap could not be screwed to the bottle.
  • the invention also includes the individual bottles and bottle caps for use in a combination as aforesaid, and a bottle for use in the combination comprises a neck of substantially circular crosssection and having screw threads extending around the neck, and one element of a key and keyway system formed on the neck or on a member axially secured to the neck, the element extending axially of the neck.
  • a bottle cap for use in the combination is formed with circumferentially extending screw threads, and one element of a key and keyway system extending axially of the cap.
  • the elements of the key and keyway system must have a directional component extending axially of the bottle neck it is not essential that these elements extend exactly parallel to the axis of the neck, although this is preferred.
  • the mating key and keyway system may be provided.
  • the first of these is to interrupt the thread on the neck of the bottle with at least two axially extending keyway grooves and to provide the matching cap with at least two key ribs which may pass down the keyways and beyond the thread on the bottle before the threads on the cap engage the threads on the bottle. After the keyways have engaged properly and the threads mate then the cap may be screwed on to the bottle.
  • the second possibility is to form the upper end of the internal bore of the neck of the bottle with a reduced diameter portion in which are formed at least two axial grooves forming keyways opening into the larger diameter portion below the reduced diameter portion.
  • the cap for the bottle is then provided with centre spigot having appropriate ribs forming keys on its radially outer surface which keys may pass down through the keyways into the larger diameter part of the neck whereupon the cap will be free to rotate so that the threads on the cap and the bottle may engage.
  • the internal bore of the neck of the bottle has axially extending ribs forming keys projecting radially inwardly and the centre spigot of the cap is of a diameter such that it may fit between the keys.
  • the lower end of the spigot is provided with an enlarged diameter head having keyways cut in it to mate with the keys.
  • the most desirable form of system is one in which the bottle manufacturers can make a perfectly standard bottle which can then be easily adapted to suit the safety system contemplated by the invention.
  • a bottle for use in the safety system has a neck which is formed with an annular ridge on the outer surface thereof between the screw threads and the body of the bottle and the element of the key and keyway system is formed by or on a collar fitting around the neck and held axially thereon by the annular ridge.
  • a cap for use with this bottle is formed with two axial sections, the first of which is formed with screw threads and a second of which forms or carries an element of the key and keyway system.
  • the arrangement must be such that unless the keys and keyways on the ring and the sleeve engage then the threaded member of the cap is held axially above the threads on the neck of the bottle. Only when the keys and keyways have engaged can the cap descend sufficiently far for the threads to engage.
  • FIG. 1 shows a cross section through a first embodiment of bottle and cap according to the invention
  • FIG. 2 is an underneath plan view of a collar on the bottle of FIG. 1;
  • FIG. 3 is an underneath plan view of the cap shown in FIG. 1;
  • FIG. 4 is an underneath plan view of an alternative form of collar
  • FIG. is a cross-section through part of a cap for use with the collar shown in FIG. 4;
  • FIG. 6 is an underneath plan view of a third embodiment of collar
  • FIG. 7 is a cross-section taken through one half of an alternative bottle and cap formation according to the invention.
  • FIGS. 8 and 9 show two further embodiments of bottles and caps according to the invention.
  • this shows a standard bottle 1 having a neck formed with a conventional screw thread 2 on the outer surface thereof and having below the thread an annular ridge 3.
  • a collar 4 Fitted over the ridge is a collar 4 which is conveniently a plastics moulding.
  • the collar is formed with a number of radially inwardly projecting flexible fingers 5 which may be sprung over the annular ridge 3 to secure the collar axially in position on the neck of the bottle.
  • the collar has a flange 6 which engages the ridge 3 on the opposite side to the fingers 5.
  • the radially outer surface of the collar is provided with two axially extending ribs 7 and 8 forming key elements.
  • the collar may have a radially inwardly projecting continuous flexible flange which may deform and engage behind the ridge 3.
  • the cap for use with this bottle comprises first and second axial sections 9 and 10 respectively, the first section having an internal thread 11 and having a knurled outer surface 12. Secured to this section is a tube 13 carrying at its other end the connector for the vapourising apparatus, the tube opening into the cap and the opening being suitably sealed.
  • the second section of the cap is in the form of an annular sleeve and is provided with two axially extending grooves 14 and 15 forming keyway elements.
  • the cap In use the cap must be aligned so that key 7 engages keyway l4 and key 8 engages keyway 15, whereupon the cap is allowed to move onto the bottle to a position wherein the threads 2 and 11 may be placed in mating engagement. The cap is then screwed onto the bottle neck, the collar 4 rotating on the neck as screwing of the cap takes place.
  • the number of keys provided on the collar 4 is not critical although two may be found to be the preferred number. To provide a number of different key arrangements it is only necessary to change the angle a in FIG. 3) between the centre lines of the keys l4 and 15.
  • the ribs forming the keys may have a cross-section of any desired shape, and may for example be round or square or formed to any other more complex section.
  • FIGS. 4 and 5 show an alternative embodiment of collar and cap which may be used in combination with a bottle in the same way as described with reference to FIG. I.
  • the collar again has resil- 5 ient fingers 21 for fitting over the ridge on the neck of the bottle but in this case the radially outer surface of the collar is formed with axially extending grooves 22 and 23 forming keyways.
  • the cap 24 for use with this collar is again in two axial sections 25 and 26, the second section being in the form of an annular sleeve formed on its radially inner surface with two axially extending ribs 27 and 28.
  • the angular disposition of the ribs 27 and 28 is the same as that of the grooves 22 and 23 so that the cap can be mated with the collar and moved to a position on the bottle wherein the screw threads 29 on the first section of the cap can engage the threaded neck of the bottle.
  • the number, disposition and form of the keys and keyways may be varied as desired.
  • FIG. 6 shows a further alternative form of collar that may be applied to a bottle as shown in FIG. 1.
  • the collar 30 has a radially inner surface 31 of substantially annular form, and is formed with a number of resilient fingers such as 32 for fitting over the ridge on the bottle neck.
  • the radially outer surface of the collar is hexagonal and in itself forms a key element.
  • a cap for use with this collar will be of similar form to that shown in FIG. 5, but the skirt 26 of the cap will be hexagonal to fit over the hexagonal collar.
  • collars have polygonal outer surfaces with sides numbering other than six may also be used, in conjunction with caps having mating polygonal skirts. Such cap and bottle combination are used in exactly the same way as described with reference to FIG. 1.
  • FIG. 7 shows part of the neck of a standard bottle having a conventional screw thread 41 on the outer surface thereof and having below the thread an annular ridge 42.
  • a collar 43 which may conveniently be a zinc base die casting having four fingers such as 44.
  • the fingers 44 will lie in the same plane as the rest of the ring so that the ring may be passed over the thread and on to the ridge and the fingers can then be deformed inwardly beneath the ridge to secure the ring to the ridge.
  • the ring has two or more keys 45 formed on the radially outer surface thereof.
  • the cap for use with this bottle comprises a member 46 having an internal thread 47 and provided with a knurled section 48. Secured to the member 46 is a tube 49 carrying at its other end the connector for the vapourising apparatus, the tube 49 opening into the cap and the opening being suitably sealed. Radially surrounding the member 46 is an annular sleeve 50 made to be axially captive on the sleeve by virtue of the flange surfaces 51 and 52. The lower end of the tubular sleeve is formed with slots or keyways 53 for engaging the keys 45 on the collar 43.
  • the keys and keyways 45 and 53 In use the keys and keyways 45 and 53 must be engaged to allow the sleeve 50 to descend to a position wherein the threads 41 and 47 may be placed in mating engagement. The cap is then screwed onto the bottle neck, moving axially within the sleeve and also rotating relative to the sleeve 50 as this occurs. In this arrangement the collar 44 is not capable of rotation relative to the bottle neck as it is in the embodiment described with reference to FIG. 1. It will be understood that the keys and keyways on the collar and the cap may be varied in similar manner to that in which the correspond ing elements shown in FIG. 1 may be varied.
  • the sleeve 50 and part 46 may be made integral, with the sleeve portion having a larger internal diameter than the diameter over the tips of the keys 45 on collar 43.
  • a ring having an internal diameter greater than the external diameter of collar 43, but less than the diameter over the tops of the keys 45.
  • This ring is interrupted by axial keyways which are designed to mate with the keys.
  • FIGS. 8 and 9 both show further alternative systems which would require separate distinct moulds for bat tles destined for each different anaesthetic.
  • the neck of a bottle 60 is formed with an external thread 61 which is interrupted by at least two axially extending grooves such as 62 forming keyway elements.
  • the corresponding cap has a first axial section 63 formed with internal threads 64 and a second axial section 65 in the form of an annular sleeve formed with two axially extending ribs 66 forming keys which may mate with the keyways formed by grooves 62. It will be seen that the cap must be properly aligned with the bottle so that the keys 66 can pass through the grooves 62 before the threaded portions of the cap and the bottle are in engagement.
  • the neck of a bottle 70 has a thread 71 formed externally on the neck, and the internal surface of the neck has a reduced diameter portion 72 extending from the open end of the neck towards the body of the bottle.
  • This portion is formed with two axially extending grooves such as 73 forming keyways opening into a larger diameter portion 74 of the neck.
  • the corresponding cap is formed with a radially outer sleeve 75 on which the screw threads 76 are formed and a radially inner spigot 77 for fitting within the bottle neck.
  • the radially outer surface of that end of the spigot which is axially remote from the screw thread 76 is formed with two axially extending ribs 78 forming key elements which can mate with the keyways formed by the slots such as 73. It will be seen that the keys 78 must be passed through the slot 73 before the screw threads on the cap can engage those on the bottle.
  • FIGS. 8 and 9 may of course be modified in the number and formation of the key and keyway elements.
  • said bottle comprises a neck of substantially circular crosssection screw threads extending around said neck, a member axially secured to said neck, and a first element of a key and keyway system formed by or on said member and extending axially of the neck, and said cap is formed with circumferentially extending screw threads, and a second element of said key and keyway system extending axially of said cap.
  • a combination according to claim 2 in which an annular ridge is formed on the outer surface of said neck between said screw threads and the body of the bottle, and said first element is formed by or on a collar fitting around said neck and held axially thereon by said annular ridge, and said cap comprises first and second axial sections, said first section being formed with said screw threads and said second section forming or carrying said second element of said key and keyway system.
  • a combination according to claim 3 in which said collar is of substantially annular form and said first element is constituted by two or more axially extending grooves forming keyway elements on the radially outer surface of said collar, and said second axial section of said cap is in the form of an annular sleeve provided with two or more axially extending ribs forming key elements.
  • a combination according to claim 3 in which said collar has a radially inner surface of substantially circular form, and a radially outer surface which is polygonal and in itself forms a key element and said second section of said cap is in the form of a skirt having a polygonal inner surface forming a keyway element.
  • said bottle comprises a neck having a screw thread formed thereon, said screw thread being interrupted by at least two axially extending grooves forming keyway elements and said cap comprises first and second axial sections, said first section being formed with screw threads for mating with those on said bottle and said second section being in the form of an annular sleeve provided with two or more axially extending ribs forming key elements.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Emergency Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • Pulmonology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Closures For Containers (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
US00252114A 1971-05-10 1972-05-10 Anaesthetic supply Expired - Lifetime US3779414A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1402371A GB1394216A (en) 1971-05-10 1971-05-10 Anaesthetic supply

Publications (1)

Publication Number Publication Date
US3779414A true US3779414A (en) 1973-12-18

Family

ID=10033589

Family Applications (1)

Application Number Title Priority Date Filing Date
US00252114A Expired - Lifetime US3779414A (en) 1971-05-10 1972-05-10 Anaesthetic supply

Country Status (10)

Country Link
US (1) US3779414A (de)
JP (1) JPS5235955B1 (de)
AU (1) AU472561B2 (de)
CA (1) CA1009982A (de)
DE (1) DE2222601C2 (de)
FR (1) FR2137642B1 (de)
GB (1) GB1394216A (de)
IT (1) IT960380B (de)
SE (1) SE377994B (de)
ZA (1) ZA722969B (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4629590A (en) * 1984-10-15 1986-12-16 Cimco Nebulizer
US5381907A (en) * 1993-05-11 1995-01-17 Stukuls; Alfred Bottle display and secure storage rack
WO1998025665A1 (en) * 1996-12-11 1998-06-18 Abbott Laboratories Anesthetic vaporizer draining system
US6176381B1 (en) 2000-01-04 2001-01-23 Stanley C. Mader Child resistant container system with movable latch
US20020096519A1 (en) * 2000-09-22 2002-07-25 Claudia Joost Tank cap for a fuel tank
US20060091237A1 (en) * 2004-10-28 2006-05-04 Dodd Joseph K Liquid sprayer assembly
US20090026225A1 (en) * 2007-07-23 2009-01-29 Conopco, Inc., D/B/A Unilever Household liquid dispenser with keyed spout fitment and refill
GB2457811A (en) * 2008-02-26 2009-09-02 Segede Bottle closure system
GB2457812A (en) * 2008-02-26 2009-09-02 Segede Bottle closure system

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3510166A1 (de) * 1985-03-21 1987-01-22 Tecnotrans Ag Umfuellverschluss fuer chemisch-pharmazeutische substanzen und verfahren zu seiner herstellung
DE3903508A1 (de) * 1989-02-06 1990-08-09 Unilever Nv Verschliessbarer behaelter
GB9005688D0 (en) * 1990-03-14 1990-05-09 Boc Group Plc A device for filling an anaesthetic vaporiser
SE464560B (sv) * 1990-03-30 1991-05-13 Siemens Elema Ab Anordning foer paafyllning och avtappning av anestesimedel
GB9101560D0 (en) 1991-01-24 1991-03-06 Boc Group Plc Fluid delivery system
GB2264688B (en) * 1992-03-07 1996-06-05 Nichols Foods Ltd Drinks vending machine
GB2279069B (en) * 1993-06-19 1997-03-05 Archibald Gerard Mciver Container
DE102004061392B3 (de) * 2004-12-21 2006-05-04 Dräger Medical AG & Co. KG Füllsystem für einen Narkosemittelverdunster

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3684117A (en) * 1971-03-18 1972-08-15 Norbert Leopoldi Dial-actuated safety cap
US3693820A (en) * 1971-06-03 1972-09-26 Robert P Linkletter Safety closure cap

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2169686A (en) * 1937-03-31 1939-08-15 Guardian Safety Seal Company Sealed receptacle
DE730028C (de) * 1939-06-15 1943-01-06 Freitag & Co Komm Ges Verschluss fuer Fluessigkeitsbehaelter mit Gewinde-Einfuellstutzen
FR1471129A (fr) * 1966-03-15 1967-02-24 Arton Ind Dispositif de fermeture de sécurité pour récipients
GB1193241A (en) * 1968-01-05 1970-05-28 Cyprane Ltd Improvements in or relating to Volatile Anaesthetic Vaporising apparatus and a Filling System therefor
DE1757412A1 (de) * 1968-05-04 1970-08-13 Rijkhoek Karel Willem Gefaess wie Flasche,Dose,Topf u.dgl. mit Sicherheitsverschluss

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3684117A (en) * 1971-03-18 1972-08-15 Norbert Leopoldi Dial-actuated safety cap
US3693820A (en) * 1971-06-03 1972-09-26 Robert P Linkletter Safety closure cap

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4629590A (en) * 1984-10-15 1986-12-16 Cimco Nebulizer
US5381907A (en) * 1993-05-11 1995-01-17 Stukuls; Alfred Bottle display and secure storage rack
WO1998025665A1 (en) * 1996-12-11 1998-06-18 Abbott Laboratories Anesthetic vaporizer draining system
US5915427A (en) * 1996-12-11 1999-06-29 Abbott Laboratories Anesthetic vaporizer draining system
US6176381B1 (en) 2000-01-04 2001-01-23 Stanley C. Mader Child resistant container system with movable latch
US20020096519A1 (en) * 2000-09-22 2002-07-25 Claudia Joost Tank cap for a fuel tank
US20060091237A1 (en) * 2004-10-28 2006-05-04 Dodd Joseph K Liquid sprayer assembly
US7407117B2 (en) 2004-10-28 2008-08-05 Meadwestvaco Calmar, Inc. Liquid sprayer assembly
US20090026225A1 (en) * 2007-07-23 2009-01-29 Conopco, Inc., D/B/A Unilever Household liquid dispenser with keyed spout fitment and refill
US7832595B2 (en) 2007-07-23 2010-11-16 Conopco, Inc. Household liquid dispenser with keyed spout fitment and refill
GB2457811A (en) * 2008-02-26 2009-09-02 Segede Bottle closure system
GB2457812A (en) * 2008-02-26 2009-09-02 Segede Bottle closure system
GB2457811B (en) * 2008-02-26 2010-01-27 Segede Container with alignment means
GB2457812B (en) * 2008-02-26 2010-05-12 Segede Improvment to containers

Also Published As

Publication number Publication date
JPS5235955B1 (de) 1977-09-12
GB1394216A (en) 1975-05-14
FR2137642B1 (de) 1976-08-06
FR2137642A1 (de) 1972-12-29
AU4207972A (en) 1973-11-15
DE2222601C2 (de) 1984-08-16
DE2222601A1 (de) 1972-11-16
SE377994B (de) 1975-08-11
ZA722969B (en) 1973-04-25
AU472561B2 (en) 1976-05-27
CA1009982A (en) 1977-05-10
IT960380B (it) 1973-11-20

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