SU673160A3 - Литьева форма дл изготовлени соединительных муфт из полимерных материалов - Google Patents
Литьева форма дл изготовлени соединительных муфт из полимерных материаловInfo
- Publication number
- SU673160A3 SU673160A3 SU762319110A SU2319110A SU673160A3 SU 673160 A3 SU673160 A3 SU 673160A3 SU 762319110 A SU762319110 A SU 762319110A SU 2319110 A SU2319110 A SU 2319110A SU 673160 A3 SU673160 A3 SU 673160A3
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- mould
- polymeric materials
- making coupling
- coupling
- cores
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14598—Coating tubular articles
- B29C45/14622—Lining the inner or outer surface of tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1657—Making multilayered or multicoloured articles using means for adhering or bonding the layers or parts to each other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1676—Making multilayered or multicoloured articles using a soft material and a rigid material, e.g. making articles with a sealing part
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/06—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/06—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end
- F16L47/08—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end with sealing rings arranged between the outer surface of one pipe end and the inner surface of the sleeve or socket, the sealing rings being placed previously in the sleeve or socket
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1657—Making multilayered or multicoloured articles using means for adhering or bonding the layers or parts to each other
- B29C2045/1664—Chemical bonds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/24—Pipe joints or couplings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
- B29L2031/265—Packings, Gaskets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Joints With Sleeves (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
Литьева форма дл изготовлени соедшштельных муфт из полимерных материалов содержит пару монтажных плит 1 и 2, на каждой плите соосно закреплены два сердечника 3 и 4, наружна конфигураци которых соответствует внутренним размерам муфты, и закрепленную н неподвижной плите 1 коодентриЧйо серДечгшкам 3 и 4 обойму 5, Щ5ичём радиальный saaioj) между обоймой 5 и сердечниками 3 и 4 образует форгйующую полбсть.
Литьева фирма выполнена с впусккй.шот верстием б и дополнительньИм 1ййуСкнй1й otsepстием 7, а на сердечник 4 и 3 убтайойлейы дистанционные втулки 8 и 9 с фЬрМзтоаоШй .част ми 10 и 11, ;
Дистгвдйоннь1е втулки 8 и 9 оснащёдь кйха-. низмом ввода их в зазор между оёоймой 5 и сердечниками 3 и 4 до еонрикосновшй с другом при формовании первого сло муфты. Радиально к сердечникам 3 и 4 ус1айойЯе1Ш пьдаижные св занные меЖЕО собой плиты 12 и 13 имеющие гигрзвлическ привод.
Литьева форма работает епетушщм образом .
В начале работы литьева форма находитс в сомкнутом состо нии. Дистанционные втулки 8 и 9 сведены вместе, так что между их формующими част ми 10 и Н и обоймой S образуетс полость. Посредством иижекционного цилишфа Ндоторый взаимодействует с впуск 9 ш . отверстием 6 сердечника 3, через пйПшкЬВые каналы, образованные между торцами сердечников 3 U 4j в эту полость впрыскиваетс расплавленный материал, например аолйпропиден, который образует каркас 15 оое шшелъной муфi ты. После этого начинаетс второй этап формйвани . И;кжекци01шый цшодцф 14 ото;фи|-аетс приводом в сторону, который, в сёШ очередь, отводит в разные стороны свййанйме с ним даотаиционные втулки 8 и 9. Затем в райизл| 1и м йаправленш сдвигаютс нодаижные плить 12 и. 13 так, что между ними, е дечниками 3 ia 4 и , первым отфор|у ованйым. слоем муфть образуетс замкнута ПОЛОСТЬ; После этого йнжёкийонный цилинщ) 16 взаимодействует с йопрлнйтельным впускным омер.стием и впрыскивает расставленный состав под давлением в эту полость в результате чего на первом слое соединительной муфты образуетс второй уплотнительный слой 17. Материалы двух слоев подбирают таким : образом, чтобы во врем лить под давлением между ними устанавливалась прочна химическа св зь. Кроме того, прочна св зь между сло ми обеспечиваетс замковой конструкцией выступов 18 каркаса 15 соеданитёльный муфты. ,
После окончани второго цикла формовани литьевую форму размьпсают при помощи Подвижной длиты 2, и готовую соединительную .муфту удал ют из формы. Затем цикл повтор етс . ;.-- , ,,. - . .-;
Использование предлагаемой литьевой фор№ позволит веста изготовление двухслойных соедитштель ых муфт.
Claims (2)
1.Демин Е. Н. Конструирование пресс-форм дл пластических материалов. Лениздат, 1960, с. 149-150.
2.Патент США N 3435483, кл. 18-42, 1969.
/2 8
// 10
6 f
Ч
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB437275A GB1477074A (en) | 1975-01-31 | 1975-01-31 | Manufacture of pipe couplings |
Publications (1)
Publication Number | Publication Date |
---|---|
SU673160A3 true SU673160A3 (ru) | 1979-07-05 |
Family
ID=9775940
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU762319110A SU673160A3 (ru) | 1975-01-31 | 1976-01-30 | Литьева форма дл изготовлени соединительных муфт из полимерных материалов |
Country Status (21)
Country | Link |
---|---|
JP (1) | JPS602168B2 (ru) |
AU (1) | AU500717B2 (ru) |
BE (1) | BE838058A (ru) |
BR (1) | BR7600594A (ru) |
CA (1) | CA1081419A (ru) |
CS (1) | CS214730B2 (ru) |
DD (1) | DD124239A5 (ru) |
DE (1) | DE2603393C2 (ru) |
DK (1) | DK152567B (ru) |
ES (1) | ES444820A1 (ru) |
FI (1) | FI760226A (ru) |
FR (1) | FR2299143A1 (ru) |
GB (1) | GB1477074A (ru) |
IE (1) | IE42251B1 (ru) |
IT (1) | IT1057104B (ru) |
NL (1) | NL7600937A (ru) |
NZ (1) | NZ179865A (ru) |
PT (1) | PT64746B (ru) |
SE (1) | SE7600996L (ru) |
SU (1) | SU673160A3 (ru) |
ZA (1) | ZA76377B (ru) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2499667C2 (ru) * | 2008-08-12 | 2013-11-27 | Стора Энсо Ойй | Формовочная система для образования отделений в контейнере на основе картона |
Families Citing this family (44)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5287855A (en) * | 1976-08-20 | 1977-07-22 | Asahi Concrete Works | Connecting work of construction among precast* box and culvert |
GB1595225A (en) * | 1977-02-04 | 1981-08-12 | Hepworth Iron Co Ltd | Coupling pipes |
GB1572100A (en) * | 1977-06-10 | 1980-07-23 | Hepworth Iron Co Ltd | Plastics pipe couplings |
DE2807022C2 (de) * | 1978-02-18 | 1982-07-01 | Fa. Carl Freudenberg, 6940 Weinheim | Dichtring |
CH643047A5 (de) * | 1978-10-18 | 1984-05-15 | Battenfeld Maschfab | Verfahren zum herstellen von fittings fuer rohrverbindungen sowie werkzeug zur ausuebung des verfahrens und nach diesem verfahren hergestelltes fitting. |
FR2447261A1 (fr) * | 1979-01-25 | 1980-08-22 | Lincrusta | Procede de fabrication d'un tube mince moule comportant des renforts epais |
NL178028C (nl) * | 1979-03-30 | 1986-01-02 | Wavin Bv | Vasthoudring met afdichtring voor een buisdeel. |
NL7909294A (nl) * | 1979-12-21 | 1981-07-16 | Wavin Bv | Werkwijze voor het verenigen van een fixatiedeel en een afdichtlichaam voor een buisverbinding. |
NL7909293A (nl) * | 1979-12-21 | 1981-07-16 | Wavin Bv | Werkwijze voor het aanbrengen van een afdichtlichaam in een groef van een mof. |
JPS5943578U (ja) * | 1982-09-16 | 1984-03-22 | 前田製管株式会社 | ボツクスカルバ−ト |
FR2550848B1 (fr) * | 1983-08-18 | 1988-08-12 | Valeo | Volet, en particulier pour installation de chauffage ou de climatisation d'un habitacle de vehicule, et son procede de fabrication |
JPS6196069U (ru) * | 1984-11-29 | 1986-06-20 | ||
NL8500075A (nl) * | 1985-01-14 | 1986-08-01 | Wavin Bv | Afdichtingsring voor een buisverbinding. |
GB8516613D0 (en) * | 1985-07-01 | 1985-08-07 | Naylor Bros Clayware Ltd | Pipe connector |
GB8517073D0 (en) * | 1985-07-05 | 1985-08-14 | Hepworth Iron Co Ltd | Pipe pipe couplings &c |
JPH0657968B2 (ja) * | 1986-02-27 | 1994-08-03 | ド−ピ−建設工業株式会社 | ボックスカルバート |
JPH0696874B2 (ja) * | 1986-05-26 | 1994-11-30 | ド−ピ−建設工業株式会社 | ボツクスカルバ−トの連結方法 |
GB2192578B (en) * | 1986-07-18 | 1990-02-14 | Wavin Bv | Pipe couplings |
GB2192577B (en) * | 1986-07-18 | 1990-01-10 | Wavin Bv | Channel conduit couplings |
ES2020276B3 (es) * | 1986-07-18 | 1991-08-01 | Wavin Bv | Acoplamientos para conductos |
JPS62169075U (ru) * | 1986-07-21 | 1987-10-27 | ||
FR2606487B1 (fr) * | 1986-11-07 | 1989-03-10 | Silix | Tubes a base de resine polyolefinique pour la realisation de canalisations, manchons pour leur assemblage et procede pour leur fabrication |
US4927184A (en) * | 1986-11-07 | 1990-05-22 | Atochem | Pipes base on polyolefin resin for manufacturing pipelines and couplings for assembling them |
FR2612118B1 (fr) * | 1987-03-09 | 1989-06-16 | Draka Polva Bv | Raccord pour tuyauterie en resine a base de chlorure de vinyle comprenant un anneau d'etancheite en caoutchouc thermoplastique |
EP0457947A1 (de) * | 1990-05-23 | 1991-11-27 | RAFELD KUNSTSTOFFTECHNIK GmbH & Co. KG | Verfahren zur Herstellung von kunststoffummantelten Rohrverbindungsstücken durch Spritzgiessen |
US5681062A (en) * | 1995-09-27 | 1997-10-28 | Kunimorikagaku Ltd. | Tubular joint |
GB2310629B (en) * | 1996-02-29 | 1999-06-30 | Applied Rubber Linings Ltd | Method and apparatus for moulding a lining for a pipe or tube |
IT1288179B1 (it) * | 1996-03-08 | 1998-09-11 | Seeber Srl | Metodo per la realizzazione di articoli in materiale plastico ad almeno due componenti, impianto e stampo per la sua realizzazione. |
FR2752560B1 (fr) * | 1996-08-23 | 1998-09-25 | Lorraine Capsules Metall | Procede pour realiser un bouchon en matiere plastique et bouchon obtenu a partir dudit procede |
NL1008949C2 (nl) * | 1998-02-11 | 1999-08-12 | Inter Tooling Services Bv | Werkwijze en inrichting voor het vervaardigen van een manchetafdichting voor een kunststof fitting of fittingring. |
AU3174000A (en) * | 1999-03-10 | 2000-09-28 | Radius Plastics Limited | Corrugated pipe connector and method of manufacture |
US6231090B1 (en) * | 1999-03-31 | 2001-05-15 | Kunimorikagaku Co. Ltd. | Tubular joint |
DE19925817C1 (de) * | 1999-06-07 | 2000-08-31 | Hobas Engineering Gmbh Klagenf | Rohrkupplung und Verfahren zu ihrer Herstellung |
GB0006662D0 (en) * | 2000-03-21 | 2000-05-10 | Millan David R | Pipe end seal. (internal). |
DE60103518D1 (de) * | 2000-03-21 | 2004-07-01 | David Mullan | Verfahren und vorrichtung zur herstellung einer rohrkupplung |
JP3482431B2 (ja) * | 2001-05-10 | 2003-12-22 | 橘 敬久 | 管継手 |
DE102004027144B4 (de) * | 2004-06-03 | 2015-10-22 | Continental Automotive Gmbh | Ventil |
EP1909018B1 (de) * | 2006-10-05 | 2014-08-20 | Georg Fischer Rohrleitungssysteme AG | Rohrverbindungsformteil mit thermischer Isolierung und Verfahren zur Herstellung des Rohrverbindungsformteiles |
DE102007017157B4 (de) | 2007-04-11 | 2014-01-16 | Norma Germany Gmbh | Dichtmuffe für einen Rohrverbinder |
IT1393549B1 (it) * | 2009-04-03 | 2012-04-27 | Coes S P A | Giunzione per il collegamento a tenuta idraulica di tubi o raccordi, particolarmente in polipropilene, per impianti idraulici a bassa pressione. |
DE102009054915A1 (de) * | 2009-12-18 | 2011-06-22 | Robert Bosch GmbH, 70469 | Spritzgießverfahren zur Herstellung eines Funktionsteils mit einer Aussparung |
DE102011015462B4 (de) * | 2011-03-29 | 2021-07-08 | Markus Beck | Verfahren zur Herstellung eines Formteils |
CA2950286A1 (en) * | 2014-05-29 | 2015-12-03 | Cutting Edge Fittings And More, Llc | Flexible pipe fitting |
CN114714640B (zh) * | 2021-12-21 | 2024-07-12 | 浙江华丰新材料股份有限公司 | 一种管道连接器及其制造方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1218140B (de) * | 1955-06-15 | 1966-06-02 | Sued West Chemie Gmbh | Verbindungs-Formstueck aus Kunststoff |
US3016579A (en) * | 1957-12-27 | 1962-01-16 | Smith Corona Marchant Inc | Method of molding indicia wheels |
DE1819118U (de) * | 1960-05-24 | 1960-10-06 | Hoechst Ag | Behaelter aus polyolefinen. |
BE719782A (ru) * | 1968-08-22 | 1969-02-03 | ||
GB1236907A (en) * | 1969-02-25 | 1971-06-23 | Hepworth Iron Co Ltd | Improvements in or relating to pipe couplings |
DE2110156A1 (en) * | 1971-03-03 | 1972-09-21 | Star Kugelhalter Gmbh Dt | Injection moulding - two different plastics in sequence where first is harder and accepts moulded lip |
DE2157015C2 (de) * | 1971-11-17 | 1982-04-01 | Industriewerk Schaeffler Ohg, 8522 Herzogenaurach | Verfahren zur Herstellung einer Dichtung aus spritzbarem Werkstoff |
-
1975
- 1975-01-31 GB GB437275A patent/GB1477074A/en not_active Expired
-
1976
- 1976-01-22 ZA ZA377A patent/ZA76377B/xx unknown
- 1976-01-27 DK DK030576AA patent/DK152567B/da not_active Application Discontinuation
- 1976-01-28 IE IE159/76A patent/IE42251B1/en unknown
- 1976-01-28 CS CS76505A patent/CS214730B2/cs unknown
- 1976-01-28 PT PT64746A patent/PT64746B/pt unknown
- 1976-01-29 DD DD191026A patent/DD124239A5/xx unknown
- 1976-01-29 DE DE2603393A patent/DE2603393C2/de not_active Expired
- 1976-01-29 FR FR7602400A patent/FR2299143A1/fr active Granted
- 1976-01-29 FI FI760226A patent/FI760226A/fi not_active Application Discontinuation
- 1976-01-30 SU SU762319110A patent/SU673160A3/ru active
- 1976-01-30 BR BR7600594A patent/BR7600594A/pt unknown
- 1976-01-30 SE SE7600996A patent/SE7600996L/xx unknown
- 1976-01-30 NZ NZ179865A patent/NZ179865A/xx unknown
- 1976-01-30 CA CA244,600A patent/CA1081419A/en not_active Expired
- 1976-01-30 ES ES444820A patent/ES444820A1/es not_active Expired
- 1976-01-30 IT IT67226/76A patent/IT1057104B/it active
- 1976-01-30 NL NL7600937A patent/NL7600937A/xx active Search and Examination
- 1976-01-30 BE BE2054793A patent/BE838058A/xx unknown
- 1976-01-31 JP JP51009934A patent/JPS602168B2/ja not_active Expired
- 1976-02-02 AU AU10721/76A patent/AU500717B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2499667C2 (ru) * | 2008-08-12 | 2013-11-27 | Стора Энсо Ойй | Формовочная система для образования отделений в контейнере на основе картона |
Also Published As
Publication number | Publication date |
---|---|
GB1477074A (en) | 1977-06-22 |
SE7600996L (sv) | 1976-08-01 |
AU500717B2 (en) | 1979-05-31 |
DE2603393A1 (de) | 1976-08-19 |
FR2299143B1 (ru) | 1978-11-10 |
BE838058A (fr) | 1976-05-14 |
DK152567B (da) | 1988-03-21 |
IE42251L (en) | 1976-07-31 |
CS214730B2 (en) | 1982-05-28 |
DD124239A5 (ru) | 1977-02-09 |
PT64746B (en) | 1977-08-16 |
DK30576A (da) | 1976-08-01 |
JPS602168B2 (ja) | 1985-01-19 |
FR2299143A1 (fr) | 1976-08-27 |
IT1057104B (it) | 1982-03-10 |
ES444820A1 (es) | 1977-09-01 |
NZ179865A (en) | 1978-04-03 |
PT64746A (en) | 1976-02-01 |
JPS5217567A (en) | 1977-02-09 |
DE2603393C2 (de) | 1986-06-05 |
BR7600594A (pt) | 1976-08-31 |
IE42251B1 (en) | 1980-07-02 |
FI760226A (ru) | 1976-08-01 |
CA1081419A (en) | 1980-07-15 |
ZA76377B (en) | 1977-01-26 |
NL7600937A (nl) | 1976-08-03 |
AU1072176A (en) | 1977-08-11 |
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