GB799225A - Automatic valve for applying anaesthetics or artificial respiration - Google Patents
Automatic valve for applying anaesthetics or artificial respirationInfo
- Publication number
- GB799225A GB799225A GB1384/55A GB138455A GB799225A GB 799225 A GB799225 A GB 799225A GB 1384/55 A GB1384/55 A GB 1384/55A GB 138455 A GB138455 A GB 138455A GB 799225 A GB799225 A GB 799225A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- exhalation
- inhalation
- seat
- artificial respiration
- 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
Links
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
- A61M16/06—Respiratory or anaesthetic masks
-
- 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
- A61M16/20—Valves specially adapted to medical respiratory devices
- A61M16/208—Non-controlled one-way valves, e.g. exhalation, check, pop-off non-rebreathing valves
-
- 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
- A61M16/01—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes specially adapted for anaesthetising
-
- 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
- A61M16/06—Respiratory or anaesthetic masks
- A61M16/0605—Means for improving the adaptation of the mask to the patient
- A61M16/0611—Means for improving the adaptation of the mask to the patient with a gusset portion
Landscapes
- Health & Medical Sciences (AREA)
- Pulmonology (AREA)
- Emergency Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
- Percussion Or Vibration Massage (AREA)
Abstract
799,225. Respiratory &c. appliances. CHIRANA PRAHA, NARODNI PODNIK. Jan. 17, 1955 [Jan. 16, 1954], No. 1384/55. Class 81 (2). A valve which enables anµsthetic apparatus to be used for artificial respiration comprises sockets for attaching it to the apparatus and to a mask and an oblique exhalation pipe one end of which serves as an exhalation valve seat and the other end of which forms a seat for an inhalation valve member when the inhalation valve is open. The anµsthetic apparatus is connected to a first portion 3 of the valve construction and a mask is connected to a socket 13 formed by a second portion 1. Inside the construction, the rim of the socket 13 lies close to an oblique exhalation pipe 12 also carried by the second portion 1. An inhalation valve 11 in the form of a rubber sheet is so disposed that when open it seats on the inner end of the exhalation pipe 12. On exhalation the valve 11 closes and an exhalation valve 6, which normally seats on the outer end of the exhalation pipe 12 opens. The seat 10 of the inhalation valve is reinforced by a cross-shaped member to prevent the inhalation valve being drawn through the valve seat 10. During artificial respiration, inhalation is effected by compressing the breathing bag of the anµsthetic apparatus.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CS799225X | 1954-01-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB799225A true GB799225A (en) | 1958-08-06 |
Family
ID=5455595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1384/55A Expired GB799225A (en) | 1954-01-16 | 1955-01-17 | Automatic valve for applying anaesthetics or artificial respiration |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1102976B (en) |
GB (1) | GB799225A (en) |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3017880A (en) * | 1958-09-16 | 1962-01-23 | Brook Airway Ltd | Resuscitator |
US3105488A (en) * | 1959-09-17 | 1963-10-01 | Albert M Richards | Respiratory devices |
US3225758A (en) * | 1959-12-30 | 1965-12-28 | Morch Ernst Trier | Piston type respirator |
US3460558A (en) * | 1961-07-04 | 1969-08-12 | Aga Ab | Valve device,particularly for breathing apparatus |
US3796216A (en) * | 1972-04-24 | 1974-03-12 | K Schwarz | Resuscitator |
US4520811A (en) * | 1981-02-08 | 1985-06-04 | Grove Medical Supply, Inc. | Pulmonary resuscitator |
US5020532A (en) * | 1988-11-14 | 1991-06-04 | Baxter International Inc. | Exhalation valve for respiratory circuit |
EP0455501A1 (en) * | 1990-05-03 | 1991-11-06 | Sheldon Sturrock | Reusable pocket resuscitation mask |
JP2004000574A (en) * | 2002-04-23 | 2004-01-08 | Resmed Ltd | Adjustable respirator mask assembly having elbow assembly based on ergonomics |
EP1392215A2 (en) * | 2001-05-25 | 2004-03-03 | Respironics Inc. | Exhaust port assembly for a pressure support system |
US7011090B2 (en) * | 2001-09-07 | 2006-03-14 | Resmed Limited | Elbow for mask assembly |
WO2007068341A1 (en) * | 2005-12-14 | 2007-06-21 | Markos Mefar S.P.A. | A mask for aerosol therapy |
EP1938856A1 (en) * | 2001-11-22 | 2008-07-02 | ResMed Ltd. | Respiratory mask and gas washout vent |
US7874293B2 (en) | 2003-02-21 | 2011-01-25 | Resmed Limited | Nasal assembly |
US7926487B2 (en) | 2000-05-15 | 2011-04-19 | Resmed Limited | Respiratory mask having gas washout vent and gas washout vent assembly for a respiratory mask |
US7934501B2 (en) | 2004-07-23 | 2011-05-03 | Resmed Limited | Swivel elbow for a patient interface |
EP2319572A3 (en) * | 2002-04-23 | 2012-01-18 | ResMed Limited | Ergonomic and adjustable respiratory mask assembly with headgear assembly |
WO2012048364A1 (en) * | 2010-10-14 | 2012-04-19 | Ventific Holdings Pty Ltd | A respiratory valve apparatus |
US8371302B2 (en) | 2002-04-23 | 2013-02-12 | Resmed Limited | Ergonomic and adjustable respiratory mask assembly with frame |
USD690003S1 (en) | 2002-08-09 | 2013-09-17 | Resmed Limited | Yoked headgear |
US8826910B2 (en) | 1997-02-10 | 2014-09-09 | Resmed Limited | Mask and vent assembly therefor |
EP2292289A3 (en) * | 2003-12-31 | 2014-10-01 | ResMed Limited | Mask system |
CN104189987A (en) * | 2014-09-26 | 2014-12-10 | 吴江市江南不锈钢器材有限责任公司 | Periodic deflating type oxygen mask |
WO2018203759A1 (en) | 2017-05-01 | 2018-11-08 | Fisher & Paykel Healthcare Limited | A conduit connector assembly of a patient interface, an anti-asphyxia valve for a conduit connector assembly and a connector |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3425436A (en) * | 1966-06-10 | 1969-02-04 | Hudson Eng Co | Valve structure for self-priming pumps |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE439855C (en) * | 1925-08-25 | 1927-01-22 | August R Mueller | Inhalation and air purifying mask |
GB317213A (en) * | 1928-07-30 | 1929-08-15 | John William Gaukroger | Improvements relating to respiratory apparatus for use in the treatment of diseases |
FR1038345A (en) * | 1950-06-15 | 1953-09-28 | Gasaccumulator Svenska Ab | Respiratory |
FR1034384A (en) * | 1951-03-23 | 1953-07-22 | Device for artificial respiration |
-
1955
- 1955-01-11 DE DEC10551A patent/DE1102976B/en active Pending
- 1955-01-17 GB GB1384/55A patent/GB799225A/en not_active Expired
Cited By (89)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3017880A (en) * | 1958-09-16 | 1962-01-23 | Brook Airway Ltd | Resuscitator |
US3105488A (en) * | 1959-09-17 | 1963-10-01 | Albert M Richards | Respiratory devices |
US3225758A (en) * | 1959-12-30 | 1965-12-28 | Morch Ernst Trier | Piston type respirator |
US3460558A (en) * | 1961-07-04 | 1969-08-12 | Aga Ab | Valve device,particularly for breathing apparatus |
US3796216A (en) * | 1972-04-24 | 1974-03-12 | K Schwarz | Resuscitator |
US4520811A (en) * | 1981-02-08 | 1985-06-04 | Grove Medical Supply, Inc. | Pulmonary resuscitator |
US5020532A (en) * | 1988-11-14 | 1991-06-04 | Baxter International Inc. | Exhalation valve for respiratory circuit |
US5146914A (en) * | 1990-03-03 | 1992-09-15 | Sheldon Sturrock | Reusable, valved, transparent, pocket resuscitation mask |
EP0455501A1 (en) * | 1990-05-03 | 1991-11-06 | Sheldon Sturrock | Reusable pocket resuscitation mask |
US8833371B2 (en) | 1997-02-10 | 2014-09-16 | Resmed Limited | Mask and vent assembly therefor |
US8826910B2 (en) | 1997-02-10 | 2014-09-09 | Resmed Limited | Mask and vent assembly therefor |
US8528558B2 (en) | 2000-05-15 | 2013-09-10 | Resmed Limited | Respiratory mask having washout vent and gas washout vent assembly for a respiratory mask |
US7926487B2 (en) | 2000-05-15 | 2011-04-19 | Resmed Limited | Respiratory mask having gas washout vent and gas washout vent assembly for a respiratory mask |
EP1392215A2 (en) * | 2001-05-25 | 2004-03-03 | Respironics Inc. | Exhaust port assembly for a pressure support system |
EP1392215A4 (en) * | 2001-05-25 | 2007-11-28 | Respironics Inc | Exhaust port assembly for a pressure support system |
AU2006235803B2 (en) * | 2001-05-25 | 2009-05-21 | Respironics, Inc | Exhaust port assembly for a pressure support system |
US8826908B2 (en) | 2001-09-07 | 2014-09-09 | Resmed Limited | Elbow for mask assembly |
US7316230B2 (en) | 2001-09-07 | 2008-01-08 | Resmed Limited | Elbow for mask assembly |
US9821134B2 (en) | 2001-09-07 | 2017-11-21 | Resmed Limited | Elbow for mask assembly |
US7011090B2 (en) * | 2001-09-07 | 2006-03-14 | Resmed Limited | Elbow for mask assembly |
EP1938856A1 (en) * | 2001-11-22 | 2008-07-02 | ResMed Ltd. | Respiratory mask and gas washout vent |
EP2319570A1 (en) * | 2001-11-22 | 2011-05-11 | ResMed Limited | Respiratory mask and gas washout vent |
EP2295103A1 (en) * | 2001-11-22 | 2011-03-16 | ResMed Limited | Respiratory mask and gas washout vent |
US7938116B2 (en) | 2002-04-23 | 2011-05-10 | Resmed Limited | Ergonomic and adjustable respiratory mask assembly with headgear assembly |
US8371302B2 (en) | 2002-04-23 | 2013-02-12 | Resmed Limited | Ergonomic and adjustable respiratory mask assembly with frame |
EP2221081A1 (en) * | 2002-04-23 | 2010-08-25 | ResMed Limited | Ergonomic and adjustable respiratory mask assembly with headgear assembly |
US11110244B2 (en) | 2002-04-23 | 2021-09-07 | ResMed Pty Ltd | Ergonomic and adjustable respiratory mask assembly with elbow assembly |
US9421340B2 (en) | 2002-04-23 | 2016-08-23 | Resmed Limited | Ergonomic and adjustable respiratory mask assembly with cushion |
AU2003203835B2 (en) * | 2002-04-23 | 2010-04-29 | ResMed Pty Ltd | Ergonomic and Adjustable Respiratory Mask Assembly with Elbow Assembly |
US7997267B2 (en) | 2002-04-23 | 2011-08-16 | Resmed Limited | Ergonomic and adjustable respiratory mask assembly with elbow assembly |
US8025057B2 (en) | 2002-04-23 | 2011-09-27 | Resmed Limited | Ergonomic and adjustable respiratory mask assembly with headgear assembly |
US10905841B2 (en) | 2002-04-23 | 2021-02-02 | ResMed Pty Ltd | Ergonomic and adjustable patient interface |
EP2319572A3 (en) * | 2002-04-23 | 2012-01-18 | ResMed Limited | Ergonomic and adjustable respiratory mask assembly with headgear assembly |
US10814087B2 (en) | 2002-04-23 | 2020-10-27 | ResMed Pty Ltd | Ergonomic and adjustable respiratory mask assembly with frame |
US10729867B2 (en) | 2002-04-23 | 2020-08-04 | ResMed Pty Ltd | Ergonomic and adjustable respiratory mask assembly with headgear assembly |
EP2327443A3 (en) * | 2002-04-23 | 2012-08-08 | ResMed Limited | Ergonomic and adjustable respiratory mask assembly with headgear assembly |
EP2319571A3 (en) * | 2002-04-23 | 2012-08-08 | ResMed Limited | Ergonomic and adjustable respiratory mask assembly with headgear assembly |
US10675429B2 (en) | 2002-04-23 | 2020-06-09 | ResMed Pty Ltd | Ergonomic and adjustable respiratory mask assembly with elbow assembly |
US10307555B2 (en) | 2002-04-23 | 2019-06-04 | ResMed Pty Ltd | Ergonomic and adjustable respiratory mask assembly with cushion |
CN100584405C (en) * | 2002-04-23 | 2010-01-27 | 雷斯梅德有限公司 | Adjustable respirator mask assembly having elbow assembly based on ergonomics |
US11266804B2 (en) | 2002-04-23 | 2022-03-08 | ResMed Pty Ltd | Ergonomic and adjustable respiratory mask assembly with elbow assembly |
US8387616B2 (en) | 2002-04-23 | 2013-03-05 | Resmed Limited | Ergonomic and adjustable respiratory mask assembly with elbow assembly |
US9802018B2 (en) | 2002-04-23 | 2017-10-31 | Resmed Limited | Ergonomic and adjustable respiratory mask assembly with frame |
US8479736B2 (en) | 2002-04-23 | 2013-07-09 | Resmed Limited | Respiratory mask assembly |
US7487772B2 (en) | 2002-04-23 | 2009-02-10 | Resmed Limited | Ergonomic and adjustable respiratory mask assembly with elbow assembly |
US8997742B2 (en) | 2002-04-23 | 2015-04-07 | Resmed Limited | Ergonomic and adjustable respiratory mask assembly with cushion |
US11331448B2 (en) | 2002-04-23 | 2022-05-17 | ResMed Pty Ltd | Ergonomic and adjustable respiratory mask assembly with cushion |
EP1356843A3 (en) * | 2002-04-23 | 2004-02-25 | Resmed Limited | Ergonomic and adjustable respiratory mask assembly with elbow assembly |
US8833370B2 (en) | 2002-04-23 | 2014-09-16 | Resmed Limited | Ergonomic and adjustable respiratory mask assembly with frame |
JP2004000574A (en) * | 2002-04-23 | 2004-01-08 | Resmed Ltd | Adjustable respirator mask assembly having elbow assembly based on ergonomics |
US9669180B2 (en) | 2002-04-23 | 2017-06-06 | Resmed Limited | Ergonomic and adjustable respiratory mask assembly with elbow assembly |
US8944058B2 (en) | 2002-04-23 | 2015-02-03 | Resmed Limited | Patient interface device |
US9457162B2 (en) | 2002-04-23 | 2016-10-04 | Resmed Limited | Ergonomic and adjustable respiratory mask assembly with headgear assembly |
USD719254S1 (en) | 2002-08-09 | 2014-12-09 | Resmed Limited | Elbow connector for respiratory mask |
USD766421S1 (en) | 2002-08-09 | 2016-09-13 | Resmed Limited | Headgear for mask |
USD690003S1 (en) | 2002-08-09 | 2013-09-17 | Resmed Limited | Yoked headgear |
USD736908S1 (en) | 2002-08-09 | 2015-08-18 | Resmed Limited | Headgear-to-frame connection component for respiratory mask |
US7874293B2 (en) | 2003-02-21 | 2011-01-25 | Resmed Limited | Nasal assembly |
US11103666B2 (en) | 2003-02-21 | 2021-08-31 | ResMed Pty Ltd | Mask assembly |
US8985117B2 (en) | 2003-02-21 | 2015-03-24 | Resmed Limited | Nasal assembly |
US11583652B2 (en) | 2003-02-21 | 2023-02-21 | ResMed Pty Ltd | Mask assembly |
US11497876B2 (en) | 2003-02-21 | 2022-11-15 | ResMed Pty Ltd | Mask assembly |
US11433207B2 (en) | 2003-02-21 | 2022-09-06 | ResMed Pty Ltd | Mask assembly |
US8424530B2 (en) | 2003-02-21 | 2013-04-23 | Resmed Limited | Nasal assembly |
US8312881B2 (en) | 2003-02-21 | 2012-11-20 | Resmed Limited | Nasal assembly |
US11420004B2 (en) | 2003-02-21 | 2022-08-23 | ResMed Pty Ltd | Mask assembly |
US7900635B2 (en) | 2003-02-21 | 2011-03-08 | Resmed Limited | Nasal assembly |
US8312883B2 (en) | 2003-02-21 | 2012-11-20 | Resmed Limited | Nasal assembly |
US10518058B2 (en) | 2003-02-21 | 2019-12-31 | ResMed Pty Ltd | Mask assembly |
US10556084B2 (en) | 2003-02-21 | 2020-02-11 | ResMed Pty Ltd | Mask assembly |
US10561813B2 (en) | 2003-02-21 | 2020-02-18 | Resmed Pty Ltd. | Mask assembly |
US8286636B2 (en) | 2003-02-21 | 2012-10-16 | Resmed Limited | Nasal assembly |
US8186352B2 (en) | 2003-02-21 | 2012-05-29 | Resmed Limited | Nasal assembly |
US11090455B2 (en) | 2003-02-21 | 2021-08-17 | ResMed Pty Ltd | Nasal assembly |
US11077276B2 (en) | 2003-02-21 | 2021-08-03 | ResMed Pty Ltd | Mask assembly |
US8042546B2 (en) | 2003-02-21 | 2011-10-25 | Resmed Limited | Nasal assembly |
US11000664B2 (en) | 2003-02-21 | 2021-05-11 | ResMed Pty Ltd | Mask assembly |
EP2292289A3 (en) * | 2003-12-31 | 2014-10-01 | ResMed Limited | Mask system |
US9642978B2 (en) | 2003-12-31 | 2017-05-09 | Resmed Limited | Mask system |
US7934501B2 (en) | 2004-07-23 | 2011-05-03 | Resmed Limited | Swivel elbow for a patient interface |
WO2007068341A1 (en) * | 2005-12-14 | 2007-06-21 | Markos Mefar S.P.A. | A mask for aerosol therapy |
WO2012048364A1 (en) * | 2010-10-14 | 2012-04-19 | Ventific Holdings Pty Ltd | A respiratory valve apparatus |
US9308344B2 (en) | 2010-10-14 | 2016-04-12 | Ventific Holdings Pty Ltd | Respiratory valve apparatus |
US10272223B2 (en) | 2010-10-14 | 2019-04-30 | Ventific Holdings Pty Ltd | Respiratory valve apparatus |
CN104189987A (en) * | 2014-09-26 | 2014-12-10 | 吴江市江南不锈钢器材有限责任公司 | Periodic deflating type oxygen mask |
EP3618910A4 (en) * | 2017-05-01 | 2021-01-20 | Fisher & Paykel Healthcare Limited | A conduit connector assembly of a patient interface, an anti-asphyxia valve for a conduit connector assembly and a connector |
WO2018203759A1 (en) | 2017-05-01 | 2018-11-08 | Fisher & Paykel Healthcare Limited | A conduit connector assembly of a patient interface, an anti-asphyxia valve for a conduit connector assembly and a connector |
EP4335476A3 (en) * | 2017-05-01 | 2024-05-15 | Fisher & Paykel Healthcare Limited | Conduit connector assembly of a patient interface, an anti-asphyxia valve for a conduit connector assembly and a connector |
US12005193B2 (en) | 2017-05-01 | 2024-06-11 | Fisher & Paykel Healthcare Limited | Conduit connector assembly of a patient interface, an anti-asphyxia valve for a conduit connector assembly and a connector |
Also Published As
Publication number | Publication date |
---|---|
DE1102976B (en) | 1961-03-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB799225A (en) | Automatic valve for applying anaesthetics or artificial respiration | |
GB875790A (en) | Breathing control valve | |
GB1212528A (en) | Improvements in or relating to anesthesia apparatus and resuscitators | |
GB990870A (en) | An improved valve assembly for use with breathing apparatus | |
GB833093A (en) | A new or improved apparatus for artificial respiration | |
GB1181411A (en) | Valve Assembly | |
GB1212529A (en) | Improvements in or relating to mechanical ventilators for the lungs | |
GB768865A (en) | Self-contained breathing apparatus | |
US2887105A (en) | Mask to mask resuscitator | |
GB951724A (en) | Respiration device | |
SE309468B (en) | ||
GB1280983A (en) | Improvements in and relating to breathing apparatus | |
GB901357A (en) | Improvements in or relating to a device for administering mouth-to-mouth artificial respiration | |
GB967421A (en) | Improvements in or relating to breathing apparatus | |
GB889164A (en) | Arrangement in respirators | |
GB447334A (en) | Improvements in or relating to breathing apparatus | |
GB1068603A (en) | Resuscitation apparatus | |
GB836221A (en) | Devices for administering oxygen or other gases and methods of making them | |
GB539432A (en) | Inhalation device for use in aviation at high altitudes | |
GB872634A (en) | Face mask | |
GB992428A (en) | Improvements in or relating to respiratory apparatus for use in closed-circuit respiration | |
GB949074A (en) | Resuscitation device | |
GB783434A (en) | Improvements in and relating to breathing apparatus | |
GB868606A (en) | Apparatus for controlling or assisting respiration | |
GB550860A (en) | Means for breathing mixtures of gases at low temperatures |