US3822561A - Self contained air cooling unit - Google Patents

Self contained air cooling unit Download PDF

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Publication number
US3822561A
US3822561A US00314844A US31484472A US3822561A US 3822561 A US3822561 A US 3822561A US 00314844 A US00314844 A US 00314844A US 31484472 A US31484472 A US 31484472A US 3822561 A US3822561 A US 3822561A
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United States
Prior art keywords
space
heat exchange
circulating
refrigeration circuit
heat
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Expired - Lifetime
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US00314844A
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English (en)
Inventor
A Miller
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Denco Miller Ltd
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Denco Miller Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/02—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/02—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing
    • F24F1/032—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing characterised by heat exchangers
    • F24F1/0323—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing characterised by heat exchangers by the mounting or arrangement of the heat exchangers

Definitions

  • ABSTRACT PP 314,844 A self contained air cooling unit, comprising: a refrigeration circuit, the condensing system of which is lo- [30] Foreign Application Priority Data cated in the space to be cooled; a thermal reservoir A l 4 1972 Great Britain 17239/72 cons sting of an ice bank contained in a flexible tank and 1n heat exchange relationship with the cooling systemof the refrigeration circuit, a circulating system in [52] US.
  • This separate water chilling unit in turn comprises a reservoir tank, and water pump or circulator for circulating the cooling medium from the reservoir to the heat exchanger in the space to be cooled, and a refrigeration circuit which includes a water chilling heat exchanger, a refrigeration compresser, a condenser, a refrigerant receiver, an expansion valve for determining the refrigerant evaporating temperature, and an electrical control circuit.
  • the refrigeration circuit may be remotely situated or mounted in a cabinet together with the air circulating andheat exchange unit.
  • the present invention provides a portable self contained air cooling unit for removing heat from a space when required without the use of external pipe work or duct work or an external source ofair for ventilation of the refrigeration unit.
  • the only external power source required will be an electrical supply.
  • the invention consists in a self contained air cooling unit, comprising: a refrigeration circuit the condensing system of which is located in the space to be cooled; a thermal reservoir for containing a thermal mass of heat exchange liquid in heat exchange relationship with the cooling system of the refrigeration circuit; means providing heat exchange communication between the space and the reservoir and including a heat exchange configuration in the space to be cooled; means for circulating air in the space in heat exchange contact with theheat exchange configuration; and means for selectively and alternatively operating the refrigeration circuit and the provision of heat exchange communication between the space and the reservoir to heat or to cool the space respectively.
  • a circulating system in communication with I the reservoir and including a heat exchanger located in the space to be cooled for exchanging heat from the air in the space to the heat exchange liquid together with means for circulating the heat exchange liquid through theheat exchanger.
  • the invention consists in a self contained air cooling unit
  • a refrigeration circuit the condensing system of which is located in the space to be cooled; a thermal reservoir for containing a thermal mass of heat exchange liquid in heat exchange relationship with the cooling system of the refrigeration circuit; a circulating system in communication with the reservoir and including a heat exchanger located in the space to be cooled for exchanging heat from the air in the space to the,
  • heat exchange liquid together with means for circulating the heat exchange liquid through the heat exchanger; means for circulating air in the space around the heat exchanger; and means for selectively and alternatively operating the refrigerating circuit and the circulating system to heat or to cool the said space respectively.
  • the operation of the refrigeration circuit and the circulating system will usually be controlled automatically by means of a time clock 21.
  • the automatic operation of the time clock can be overridden manually, if de' sired.
  • the thermal reservoir is an ice bank, but may comprise another fluid or material having suitable properties for thermal accumulation, for example a eutectic composition or a volume of chilled water at a temperature lower than that of the space to be cooled.
  • the ice bank is preferably held in a flexible tank in which is located the evaporator of the refrigeration system.
  • the heat exchanger for cooling the space will usually consist of an air cooling coil arranged in the space and through which chilled water is circulatedfrom the ice bank.
  • the heat exchanger is an extended fin liquid to air type through which chilled water is passed through the tube side while air from the space to be cooled is circulated over the fin side.
  • the water in contact with the ice bank or other thermal storage media is usually circulated by means of a submerged pump or circulator located in the flexible tank.
  • the refrigeration circuit will usually be a regular refrigeration circuit and comprise a refrigeration compressor, a condenser arranged in the space to be heated or cooled, a liquid receiver, an expansion valve, and an evaporator which in the preferred embodiment referred to above consists of an ice forming coil arranged in the thermal reservoir.
  • the means for circulating air in the space around the heat exchanger will usually be a fan, and, in a preferred construction, a single fan is arranged to circulate air both through the heat exchanger and the condensing system of the refrigeration circuit.
  • the cooling unit is provided with two circuits, one circuit comprising the refrigeration system for freezing the water to form the ice bank and, additionally, as a by product to provide heating in the space by using heat rejected from refrigeration condenser, and the other circuit comprising the chilled water circulation system for cooling the space during the cooling phase.
  • the heat exchanger for cooling the air and the refrigation condenser are contained in separate circuits but are constructed in a single unit thus allowing example in climates with high day and low night temperatures cooling is generally required for known periods of the day and during the night there is usually a need for heating.
  • the heating phase is satisfied by removing the heat from the quantity of water held in the thermal reservoir by means of the regular refrigeration circuit.
  • the heat so removed is passed into the space by means of the condensing process of the refrigeration system.
  • the reduction in water temperature will change the state of the water into ice until at the end of the heating phase the water has nearly all frozen.
  • the water in contact with the ice bank previously formed during the heating phase is circulated by means of the pump or circulator into the heat exchanger coil of the chilled water circulation system, the water now heated by the cooling process being returned into contact with the ice bank thereby losing the heat gained by melting a quantity of the ice. Cooling is thus available until the ice is fully melted.
  • FIG. 1 is a schematic diagram of an air cooling unit
  • FIG. 2 is a schematic side view of theair cooling unit of FIG. 1;
  • FIG. 3 is an enlarged view of a detail of the cooling unit shown in FIG. 2.
  • the air cooling unit shown in the drawing is intended primarily for cooling a space 1, and essentially comprises achilled water circulation system 2 communicating with an ice bank 3, and a refrigeration system 4 for depositing ice in the ice bank.
  • the refrigeration system 4 itself comprises a condenser 5 arranged in the space 1, a liquid receiver 6, an expansion valve 7, an ice forming coil 8, and a compressor 9, connected in sequence by pipework 10.
  • the ice forming coil 8 is contained in a flexible tank 11 which holds the chilled water to be passed through the circulation system 2.
  • the circulation system 2 incorporates an air cooling coil 12 arranged in the space 1 and communicating with the ice bank 3 through pipework l3. Chilled water is passed through the circulation system by means of a submerged pump or circulator 14 arranged in the tank 1 1.
  • a fan 15 is provided in the space 1 for circulating air I both through the condenser 5 of the refrigeration system 4 and the air cooling coil 12 of the circulation system 2.
  • the direction of flow of the refrigerant through the refrigeration system 4 and of the chilled water through the circulation system 2 is indicated by arrows 16 and 17 respectively.
  • the air cooling unit is contained in a cabinet 18. In the side walls of the cabinet there are provided grills 19 through which air may be drawn into the unit, and in the top of the unit there is a grill 20 through which air is passed from the unit into the space Ice is formed and deposited in the ice bank by operation of the refrigeration system 4 to heat the space 1.
  • the refrigerant is pressurized by the compressor 9 and passed through a pipe situated in the ice bank. The pipe is installed in close proximity to the inlet of the submerged pump and to the outlet pipe of the pump.
  • the hot gas is then passed to the space l where it is condensed in the condenser 5 and its heat removed and given off into the space 1.
  • the condensed refrigerant is then passed via the liquid receiver 6 and expansion valve 7 through the ice forming coil 8 where it evaporates. Evaporation of the refrigerant absorbs heat from water held in the tank 11, the reduction in water temperature changing the state of the water into ice until at the end of the operation of the refrigeration system nearly all the water in the tank has frozen.
  • the water in contact with the ice bank 3 formed by the previous heating of the space as described above is circulated by means of the pump 14 through the heat exchanger coil 12 through which the air in the space is circulated by the fan 15. Heat is absorbed by the circulating chilled water thus cooling the space, and the heated water is returned into contact, with the ice bank where it loses the heat gained by melting a quantity of ice. Chilled water is available for cooling the space until all the iceis fully melted.
  • the periods of cooling and ice regeneration by heating the space may be operated automatically by means of a time clock 21; the automatic operation of the time clock 21 can be overridden to provide immediate cooling of the space for a reduced period when required.
  • the tank 1 1 is suitably constructed to contain approximately 30 gallons of water.
  • the unit may then be arranged to operate on a 24 hour cycle so that cooling will be provided during the daytime and the ice bank regenerated during the night time, giving off heat as a by-product.
  • Such a unit would require approximately 16 hours to fully regenerate the ice bank,'and after regeneration may be sutomatically switched over to cooling by the time clock when it will then provide 6 to 7 hours of cooling.
  • the fan 15 may be provided with a two position switch to provide two capacities of cooling, the unit operating on the cooling cycle for a longer period of time on the minimum cooling rate than on the maximum cooling rate. For example the unit may provide 6 hours of cooling at maximum fan capacity or 7 hours of cooling at low fan capacity.
  • a self contained air cooling unit comprising: a refrigeration circuit, the condensing system of which is located in the space to be cooled; a thermal reservoir for containing a thermal mass of heat exchange liquid in heat exchange relationship with the cooling system of the said refrigeration circuit; means providing heat exchange communication between the said space and the said reservoir and including a heat exchange config uration in the space to be cooled; means for circulating air in the said space in heat exchange contact with the said heat exchange configuration; means for selectively and alternatively operating the refrigeration circuit, the provision of heat exchange communication between the said space and the said reservoir to heat or to cool the said space respectively, and wherein a part of the refrigeration circuit downstream of the refrigeration compressor is located in the thermal reservoir and adjacent the said means for circulating the heat exhange liquid.
  • a self contained air cooling unit comprising: a refrigeration circuit, the condensing system of which is located in the space to be cooled; a thermal reservoir for containing a thermal mass of heat exchange liquid in heat exchange relationship with a cooling system of the said refrigeration circuit; a circulating system in communication with the said reservoir and including a heat exchanger located in the space to be cooled for exchanging heat from the air in the said space to the said heat exchange liquid together with means for circulating the said heat exchange liquid through the heat exchanger; means for circulating air in the said space around the said heat exchanger; means for selectively and alternatively operating the said refrigeration circuit and the said circulating system to heat or to cool the said space respectively, and wherein a part of the refrigeration circuit downstream of the refrigeration compressor is located in the thermal reservoir and adjacent the said means for circulating the heat exchange liquid.
  • An air cooling unit as claimed in claim 5 wherein a single fan is arranged to circulate air both through the said heat exchanger and through the said condensing system of the refrigeration circuit.
  • An air cooling unit as claimed in claim 2 wherein said means for selectively and alternatively operating the said refrigeration circuit and the said circulating system comprises a time clock for automatically operating the refrigeration system and the circulating system.
  • An air cooling unit as claimed in claim 7 further comprising means provided for manually overriding the operation of the time clock to provide immediate cooling for a reduced period.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Air Conditioning Control Device (AREA)
US00314844A 1972-04-14 1972-12-13 Self contained air cooling unit Expired - Lifetime US3822561A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1723972*[A GB1391703A (en) 1972-04-14 1972-04-14 Self contained air cooling and heating unit

Publications (1)

Publication Number Publication Date
US3822561A true US3822561A (en) 1974-07-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00314844A Expired - Lifetime US3822561A (en) 1972-04-14 1972-12-13 Self contained air cooling unit

Country Status (9)

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US (1) US3822561A (enrdf_load_stackoverflow)
JP (1) JPS5216653B2 (enrdf_load_stackoverflow)
CA (1) CA991407A (enrdf_load_stackoverflow)
DE (1) DE2244722C3 (enrdf_load_stackoverflow)
FR (1) FR2179713B1 (enrdf_load_stackoverflow)
GB (1) GB1391703A (enrdf_load_stackoverflow)
IT (1) IT976254B (enrdf_load_stackoverflow)
NL (1) NL7217242A (enrdf_load_stackoverflow)
SE (1) SE390842B (enrdf_load_stackoverflow)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4347714A (en) * 1980-07-25 1982-09-07 The Garrett Corporation Heat pump systems for residential use
US4347711A (en) * 1980-07-25 1982-09-07 The Garrett Corporation Heat-actuated space conditioning unit with bottoming cycle
US5265442A (en) * 1992-05-12 1993-11-30 Lamie Thomas T Non-compressive auxiliary air conditioning system
US5606865A (en) * 1994-07-06 1997-03-04 Caron; Leofred Portable air cooler
US20050217302A1 (en) * 2004-03-16 2005-10-06 Michael Nicolai Cooling device for a switchgear cabinet
US20070295036A1 (en) * 2004-08-23 2007-12-27 Reckitt Benckiser N.V. Detergent Dispensing Device
US20080293604A1 (en) * 2005-11-07 2008-11-27 Reckitt Benckiser N.V. Dosage Element
US20090235959A1 (en) * 2005-11-07 2009-09-24 Reckitt Benckiser N.V. Assembly and Device
US20090308414A1 (en) * 2006-01-21 2009-12-17 Reckitt Benckiser N.V. Dosage Element and Chamber
US20100031978A1 (en) * 2006-10-30 2010-02-11 Reckitt Benckiser N.V. Multi-Dosing Detergent delivery device
US20100089422A1 (en) * 2006-10-30 2010-04-15 Reckitt Benckiser Nv Multi-Dosing Detergent Delivery Device
US20100104488A1 (en) * 2006-10-30 2010-04-29 Reckitt Benckiser N. Multi-Dosing Detergent Delivery Device
US20100135874A1 (en) * 2006-10-30 2010-06-03 Reckitt Benckiser N.V. Multi-Dosing Detergent Delivery Device
US20100155428A1 (en) * 2006-10-30 2010-06-24 Reckitt Benckiser Nv Mounting Device
US20100170302A1 (en) * 2006-10-30 2010-07-08 Reckitt Benckiser N.V. Multi-Dosing Detergent Delivery Device
US20100179087A1 (en) * 2006-10-30 2010-07-15 Reckitt Benckiser Production (Poland) sp.z.o.o Compressed Detergent Composition
US20100186781A1 (en) * 2007-05-30 2010-07-29 Reckitt Benckiser N.V. Detergent Dosing Device
US20100200025A1 (en) * 2007-05-30 2010-08-12 Reckitt Benckiser N.V. Detergent Dosing Device
US8146609B2 (en) 2006-10-30 2012-04-03 Reckitt Benckiser N.V. Device status indicator for a multi-dosing detergent delivery device
US8338357B2 (en) 2006-01-21 2012-12-25 Reckitt Benckiser N.V. Multiple dosing ware washing article
US20140140829A1 (en) * 2012-11-16 2014-05-22 United Technologies Corporation Turbine engine cooling system with an open loop circuit
US20150320588A1 (en) * 2014-05-09 2015-11-12 Sleepnea Llc WhipFlash [TM]: Wearable Environmental Control System for Predicting and Cooling Hot Flashes
CN112484164A (zh) * 2019-09-11 2021-03-12 广东美的制冷设备有限公司 空调器

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4125695A (en) * 1977-01-06 1978-11-14 Pennwalt Corporation Polymerization process with reduced cycle time employing polyfunctional free radical initiators
JPS5461334U (enrdf_load_stackoverflow) * 1977-10-07 1979-04-27
JPS5837652A (ja) * 1981-08-11 1983-03-04 Konishiroku Photo Ind Co Ltd 静電荷像現像用トナ−
JPS5981113U (ja) * 1982-11-25 1984-06-01 日本電気株式会社 出力電力制御回路
CN106016906B (zh) * 2016-07-13 2018-10-09 农喜秋 一种可移动的冰箱与空调一体机设备
CN106705307A (zh) * 2017-01-17 2017-05-24 东莞市金鸿盛电器有限公司 高效水冷空调
CN110118404A (zh) * 2019-05-23 2019-08-13 江苏热声机电科技有限公司 一种封闭空间制冷结构

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1954455A (en) * 1932-01-11 1934-04-10 American Blower Corp Air conditioning apparatus
US2153696A (en) * 1934-02-03 1939-04-11 Nash Kelvinator Corp Air conditioning system
US2160389A (en) * 1938-01-12 1939-05-30 B F Sturtevant Co Air conditioning system
US2246999A (en) * 1938-08-16 1941-06-24 Willard L Morrison Air cooling and circulating device
US2737027A (en) * 1950-11-04 1956-03-06 Air conditioning structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1954455A (en) * 1932-01-11 1934-04-10 American Blower Corp Air conditioning apparatus
US2153696A (en) * 1934-02-03 1939-04-11 Nash Kelvinator Corp Air conditioning system
US2160389A (en) * 1938-01-12 1939-05-30 B F Sturtevant Co Air conditioning system
US2246999A (en) * 1938-08-16 1941-06-24 Willard L Morrison Air cooling and circulating device
US2737027A (en) * 1950-11-04 1956-03-06 Air conditioning structure

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4347714A (en) * 1980-07-25 1982-09-07 The Garrett Corporation Heat pump systems for residential use
US4347711A (en) * 1980-07-25 1982-09-07 The Garrett Corporation Heat-actuated space conditioning unit with bottoming cycle
US5265442A (en) * 1992-05-12 1993-11-30 Lamie Thomas T Non-compressive auxiliary air conditioning system
US5606865A (en) * 1994-07-06 1997-03-04 Caron; Leofred Portable air cooler
US20050217302A1 (en) * 2004-03-16 2005-10-06 Michael Nicolai Cooling device for a switchgear cabinet
US7637118B2 (en) * 2004-03-16 2009-12-29 Rittal Gmbh & Co. Kg Cooling device for a switchgear cabinet
US20070295036A1 (en) * 2004-08-23 2007-12-27 Reckitt Benckiser N.V. Detergent Dispensing Device
US20080274025A1 (en) * 2004-08-23 2008-11-06 Reckitt Benckiser N.V. Detergent Dispensing Device
US20080308570A1 (en) * 2004-08-23 2008-12-18 Reckitt Benckiser N.V. Detergent Dispensing Device
US20090044575A1 (en) * 2004-08-23 2009-02-19 Reckitt Benckiser N.V. Detergent Dispensing Device
US20090104093A1 (en) * 2004-08-23 2009-04-23 Reckitt Benckiser N.V. Detergent dispensing device
US20100176148A1 (en) * 2004-08-23 2010-07-15 Reckitt Benckiser N.V. Detergent Dispensing Device
US8221696B2 (en) 2004-08-23 2012-07-17 Reckitt Benckiser N.V. Detergent dispensing device
US20080293604A1 (en) * 2005-11-07 2008-11-27 Reckitt Benckiser N.V. Dosage Element
US20090235959A1 (en) * 2005-11-07 2009-09-24 Reckitt Benckiser N.V. Assembly and Device
US20100212695A1 (en) * 2005-11-07 2010-08-26 Reckitt Benckiser N.V. Dosage Element
US8375962B2 (en) 2006-01-21 2013-02-19 Reckitt Benckiser N. V. Dosage element and chamber
US8338357B2 (en) 2006-01-21 2012-12-25 Reckitt Benckiser N.V. Multiple dosing ware washing article
US20090308414A1 (en) * 2006-01-21 2009-12-17 Reckitt Benckiser N.V. Dosage Element and Chamber
US20100155428A1 (en) * 2006-10-30 2010-06-24 Reckitt Benckiser Nv Mounting Device
US20100170302A1 (en) * 2006-10-30 2010-07-08 Reckitt Benckiser N.V. Multi-Dosing Detergent Delivery Device
US20100179087A1 (en) * 2006-10-30 2010-07-15 Reckitt Benckiser Production (Poland) sp.z.o.o Compressed Detergent Composition
US20100104488A1 (en) * 2006-10-30 2010-04-29 Reckitt Benckiser N. Multi-Dosing Detergent Delivery Device
US20100135874A1 (en) * 2006-10-30 2010-06-03 Reckitt Benckiser N.V. Multi-Dosing Detergent Delivery Device
US20100089422A1 (en) * 2006-10-30 2010-04-15 Reckitt Benckiser Nv Multi-Dosing Detergent Delivery Device
US8146610B2 (en) 2006-10-30 2012-04-03 Reckitt Benckiser N.V. Multi-dosing detergent delivery device
US8146609B2 (en) 2006-10-30 2012-04-03 Reckitt Benckiser N.V. Device status indicator for a multi-dosing detergent delivery device
US20100031978A1 (en) * 2006-10-30 2010-02-11 Reckitt Benckiser N.V. Multi-Dosing Detergent delivery device
US8329112B2 (en) 2006-10-30 2012-12-11 Reckitt Benckiser N.V. Multi-dosing detergent delivery device
US20100186781A1 (en) * 2007-05-30 2010-07-29 Reckitt Benckiser N.V. Detergent Dosing Device
US20100200025A1 (en) * 2007-05-30 2010-08-12 Reckitt Benckiser N.V. Detergent Dosing Device
US8815018B2 (en) 2007-05-30 2014-08-26 Reckitt Benckiser N.V. Detergent dosing device
US20140140829A1 (en) * 2012-11-16 2014-05-22 United Technologies Corporation Turbine engine cooling system with an open loop circuit
US9739171B2 (en) * 2012-11-16 2017-08-22 United Technologies Corporation Turbine engine cooling system with an open loop circuit
US20170314415A1 (en) * 2012-11-16 2017-11-02 United Technologies Corporation Turbine engine cooling system with an open loop circuit
US10047631B2 (en) * 2012-11-16 2018-08-14 United Technologies Corporation Turbine engine cooling system with an open loop circuit
US11085325B2 (en) 2012-11-16 2021-08-10 Raytheon Technologies Corporation Turbine engine cooling system with an open loop circuit
US20150320588A1 (en) * 2014-05-09 2015-11-12 Sleepnea Llc WhipFlash [TM]: Wearable Environmental Control System for Predicting and Cooling Hot Flashes
US10179064B2 (en) * 2014-05-09 2019-01-15 Sleepnea Llc WhipFlash [TM]: wearable environmental control system for predicting and cooling hot flashes
CN112484164A (zh) * 2019-09-11 2021-03-12 广东美的制冷设备有限公司 空调器

Also Published As

Publication number Publication date
GB1391703A (en) 1975-04-23
JPS4920944A (enrdf_load_stackoverflow) 1974-02-23
DE2244722C3 (de) 1974-12-12
DE2244722B2 (de) 1974-04-11
DE2244722A1 (de) 1973-10-25
IT976254B (it) 1974-08-20
NL7217242A (enrdf_load_stackoverflow) 1973-10-16
FR2179713A1 (enrdf_load_stackoverflow) 1973-11-23
CA991407A (en) 1976-06-22
JPS5216653B2 (enrdf_load_stackoverflow) 1977-05-11
SE390842B (sv) 1977-01-24
FR2179713B1 (enrdf_load_stackoverflow) 1977-04-22

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