NO119963B - - Google Patents
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- Publication number
- NO119963B NO119963B NO160665A NO16066565A NO119963B NO 119963 B NO119963 B NO 119963B NO 160665 A NO160665 A NO 160665A NO 16066565 A NO16066565 A NO 16066565A NO 119963 B NO119963 B NO 119963B
- Authority
- NO
- Norway
- Prior art keywords
- current
- cathode
- stated
- grid
- containers
- Prior art date
Links
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims 1
- 230000004888 barrier function Effects 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/50—Moulds having cutting or deflashing means
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06905—Using combined techniques for making the preform
- B29C49/0691—Using combined techniques for making the preform using sheet like material, e.g. sheet blow-moulding from joined sheets
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
- B29C2049/4805—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity by closing the mould halves
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/48185—Moulds with more than one separate mould cavity
- B29C49/4819—Moulds with more than one separate mould cavity having different sizes or shapes of the 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/266—Auxiliary operations after the thermoforming operation
- B29C51/267—Two sheets being thermoformed in separate mould parts and joined together while still in the mould
-
- 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
- B29L2031/54—Balls
Description
Selektiv frakobling av paralleltarbeidende strømrettere ved tilbaketenninger. Selective disconnection of parallel-working rectifiers in case of back-ignitions.
Ved utladningsstrømrettere kan til-baketrekninger som bekjent slukkes på In the case of discharge rectifiers, withdrawals can be extinguished as usual
den måte at en tenning av den ikke forstyrrede anode forhindres ved hjelp av the way that an ignition of the undisturbed anode is prevented by means of
gittersperringen. Ved beholdere med flere the lattice barrier. For containers with several
anoder betegner gittersperringen den anodes denote the lattice barrier it
eneste mulighet for raskt å fjerne den ved only possibility to quickly remove it by wood
tilbaketenningen innledende kortslutning the back ignition initial short circuit
av strømrettertransformatoren, såfremt of the rectifier transformer, if applicable
der ikke kan benyttes kostbare hurtigbry-tere for hver enkelt anode eller frakob-lingen skjer på primærsiden ved hjelp av where expensive quick switches cannot be used for each individual anode or the disconnection takes place on the primary side using
en hurtigvirkende effektbryter. Skal tilbaketenningen slukkes ved hjelp av gittersperringen, er det nødvendig at sperringen a quick-acting circuit breaker. If the back-ignition is to be extinguished using the grid barrier, it is necessary that the barrier
inntrer meget raskt, om mulig allerede før occurs very quickly, if possible already earlier
tenningen av neste anode for å hindre at the ignition of the next anode to prevent that
de enkelte anoders sperreevne går tapt the blocking ability of the individual anodes is lost
ved en eventuell for stor damptrykkstig-ning. I alminnelighet går man ved en til-baketenningsbeskyttelse på gittersiden in the event of an excessively large rise in steam pressure. In general, a back-ignition protection is used on the grid side
frem slik at kortslutningsstrømmen avtas forward so that the short-circuit current decreases
fra transformatorens primærside og utlø-ser et mekanisk eller elektronisk vern som from the transformer's primary side and triggers a mechanical or electronic protection which
undertrykker de positive gitter-tennings-impulser, så bare den negative gitterforspenning virker i gitterkretsen. Ved parallelt arbeide av flere strømrettere, resp. ved suppresses the positive grid ignition impulses, so only the negative grid bias works in the grid circuit. In the case of parallel operation of several rectifiers, resp. by
matning på en motspenning, f. eks. på mo-toriske forbruksapparater, må der også i feeding on a counter voltage, e.g. on motorized consumables, there must also be i
likestrømkretsen ligge en beskyttelsesbry-ter som kobler tilbakestrømmen fra. in the direct current circuit, there is a protective switch that disconnects the return current.
Skal nu flere strømrettere som har Now need more power rectifiers that have
flere anoder hver, og som ligger til en felles transformator og styres over et felles several anodes each, and which are connected to a common transformer and controlled via a common
gitterstyreapparat, frakobles selektivt på grid control device, is selectively disconnected on
katodesiden, for at de uskadde beholdere, the cathode side, so that the undamaged containers,
etter eventuell kortvarig avbrytelse, fort- after any brief interruption, continue
satt skal kunne mate samleskinnen, opp-trer der med hensyn til utførelsen av gittersperringen endel vanskeligheter som det er den foreliggende oppfinnelses opp-gave å rydde av veien. set must be able to feed the busbar, there arise with regard to the execution of the grid barrier a number of difficulties which it is the task of the present invention to clear out of the way.
Oppfinnelsen er anvendelig i anlegg med flere parallelt- og synkront-arbei-dende strømrettere som bare har ett felles gitterstyreapparat. Det blir foreslått, når en strømretterbeholder frakobles selektivt som følge av en tilbaketenning, å sette inn koblingsmidler som begrenser tilbake-strømmens gang over gitterstyreapparatets katodesidige tilslutninger. Disse koblingsmidler forhindrer eller motvirker den ved tilbakestrømmen forårsakede nedsettelse av den negative forspenning. The invention is applicable in installations with several parallel and synchronously working rectifiers which only have one common grid control device. It is proposed, when a rectifier container is selectively disconnected as a result of a back-ignition, to insert coupling means which limit the passage of the return current over the cathode-side connections of the grid control apparatus. These coupling means prevent or counteract the reduction of the negative bias caused by the reverse current.
Dette skal anskueliggjøres eksempelvis under henvisning til fig. 1. Flere strøm-rettere, f. eks. la og lb som f. eks. har tre anoder hver, ligger på vekselstrømsi-den over anodedrosler 2a og 2b til transfor-matoren 3, hvis stjernepunkt fører til like-strømskinnen N, og på likestrømsiden til en samleskinne P med motspennings-for-brukere, noe som skal antydes ved like-strømmotoren 4. Da hver beholder skal frakobles på likestrømsiden, er der anordnet hurtigvirkende brytere 5a og 5b. De to beholdere har en felles negativ forspenning 6 og et felles gitterstyreapparat 7 som styrer gitterne over separate gitter-formotstander 8a og 8b. En rask frakobling ved hjelp av beholderens gittere i tilfelle av tilbaketenning skal skje på den måte at de impulser som leveres av styre-apparatet 7, blir undertrykket, f. eks. idet et hurtigrelé ligger med sin vikling på primærsiden av transfomatoren 3 og med sine kontakter bryter tilførselen til styre-apparatet 7. Inntrer der nu f. eks. ved be- This should be illustrated, for example, with reference to fig. 1. Several power rectifiers, e.g. la and lb as e.g. have three anodes each, are located on the alternating current side above the anode chokes 2a and 2b of the transformer 3, whose star point leads to the direct current rail N, and on the direct current side to a busbar P with counter-voltage for users, which should be indicated by equal - the current motor 4. As each container must be disconnected on the direct current side, quick-acting switches 5a and 5b are arranged there. The two containers have a common negative bias 6 and a common grid control device 7 which controls the grids via separate grid resistors 8a and 8b. A rapid disconnection by means of the container grids in the event of back-ignition must take place in such a way that the impulses delivered by the control device 7 are suppressed, e.g. as a fast-acting relay is located with its winding on the primary side of the transformer 3 and with its contacts breaks the supply to the control device 7. by request
holderen la en tilbaketenning av anoden R til den normalt brennende anode T, så the holder added a back-ignition of the anode R to the normally burning anode T, so
bryter den leverte likespenning sammen, breaks down the supplied DC voltage,
og der går en tilbakestrøm Jit fra P-skin- and there goes a return flow Jit from P-skin-
nen tilbake til den forstyrrede beholder, nen back to the disturbed container,
noe som fører til åpning av bryteren 5a, which leads to the opening of the switch 5a,
som fortrinsvis utføres polarisert. Men da nu de to beholderes katoder over en styre- which is preferably carried out polarized. But then now the cathodes of the two containers over a control
ledning fortsatt forblir forbundet ved plusspolen for den negative forspenning, wire still remains connected at the positive coil for the negative bias,
vil tilbakestrømmen fortsette å flyte over denne ledning. For å begrense denne strøm til en slik verdi, f. eks. ir, at denne styre- the return current will continue to flow over this wire. To limit this current to such a value, e.g. ir, that this board-
ledning ikke blir overbelastet, må man koble inn motstandene 9a og 9b. Tilbake-strømmen ir over disse motstander frem- line is not overloaded, resistors 9a and 9b must be connected. The return current flows across these resistors forward
kaller imidlertid et spenningsfall som har den antydede polaritet og er på høyde med strømretterens sperrespenning. I gitter- however, calls a voltage drop that has the indicated polarity and is at the level of the rectifier's blocking voltage. In grid-
kretsen, spesielt for den forsyrrede behol- the circuit, especially for the acidified container
der, blir der da innført en spenning som kan være det mangedobbelte av den ne- there, a voltage is then introduced which can be a multiple of the ne-
gative forspenning 6, hvorved en gitter- positive bias 6, whereby a grating
spenning ikke lenger blir mulig. Men der- voltage no longer becomes possible. But there-
med fortsetter også kortslutningen på vek-selstrømsiden å bestå, så at der ikke kan skje noen frigivning av den eller de uskadde parallellkoblede beholdere med henblikk på videre forsyning av samle- with the short circuit on the alternating current side also continues to exist, so that there can be no release of the undamaged parallel-connected container(s) with a view to further supply of collective
skinnen. Derfor er der f. eks. anordnet brytere 13a og 13b, som er forbundet med bryterne 5a, resp. 5b, og som i tilfelle av tilbaketenning kortslutter motstandene. Riktignok må bryterne slutte meget nøy- the rail. Therefore, there is e.g. arranged switches 13a and 13b, which are connected to the switches 5a, resp. 5b, and which in the case of back-ignition short-circuits the resistors. Admittedly, the switches must stop very precisely
aktig med åpningen av hovedkontaktene, similar to the opening of the main contacts,
noe som er vanskelig å oppnå. something that is difficult to achieve.
Bedre er derfor den vei som er vist på The way shown is therefore better
fig. 2, som består i å koble ventiler, for- fig. 2, which consists in connecting valves, for-
trinsvis tørrlikerettere 10a, resp. 10b pa- stepwise dry rectifiers 10a, resp. 10b pa-
rallelt med beskyttelsesmotstandene 9a og 9b med slik retning at der på motstandene som følge av tilbakestrømmen bare kan inntre et slikt spenningsfall som øker den negative forspenning 6, og ikke noe spen- in parallel with the protective resistors 9a and 9b in such a direction that, as a result of the return current, only such a voltage drop can occur on the resistors that increases the negative bias voltage 6, and no voltage
ningsfall som minsker den. Disse ventiler har da dessuten den fordel at beskyttelsesmotstandene 9a og 9b kan velges med en forholdsvis høy ohm-verdi, fordi avio-niseringsstrømmen under anodens brenn- ning fall that reduces it. These valves then also have the advantage that the protective resistors 9a and 9b can be selected with a relatively high ohm value, because the ionisation current during the anode's combustion
tid likeledes flyter over disse ventiler. Ved gitterimpulser som har relativt kort varig- time likewise flows over these valves. In the case of grid impulses that have a relatively short duration
het i forhold til anodens brenntid, vil den strøm som gjennomsnittlig leveres av den negative forspenning, i ledningene mellom plusspolen for den negative forspenning 6 hot in relation to the burning time of the anode, the current that is delivered on average by the negative bias, in the wires between the positive coil of the negative bias 6
og de enkelte beholderkatoder være større enn strømmen fra gitterimpulsapparatet 7. Foråt gittertennstrømmen ikke skal and the individual container cathodes be greater than the current from the grid impulse device 7. Before the grid ignition current should
minskes av den anordnede beskyttelses- is reduced by the provided protective
motstand 9, blir det videre foreslått å resistance 9, it is further proposed to
legge en kondensator lia, resp. 11b paral- add a capacitor lia, resp. 11b paral-
lelt med beskyttelsesmotstandene 9a og 9b. connected with the protection resistors 9a and 9b.
Enda en mulighet for selektiv fra- Yet another opportunity for selective de-
kobling av en beholder ved hjelp av kort- connection of a container by means of short-
varig gitterspenning er antydet på fig. permanent lattice strain is indicated in fig.
3. Her blir der for hver beholder anvendt 3. Here, there is used for each container
en særskilt gitterforspenning 6a, resp. 6b. a separate grid bias 6a, resp. 6b.
En forutsetning for at gitterpotensialet A prerequisite for the lattice potential
ikke blir utsatt for tilbakespenningsinnfly- not be exposed to reverse voltage influences
telser, er en galvanisk adskillelse av ut-gangskretsene fra den felles gitterimpuls-generator. Dette er antydet på den måte at utgangstransformatorene 7' fra denne er vist med separate viklinger. Til den midtre vikling sluttes den egentlige im-pulsgenerator, mens de to andre viklinger er innkoblet i gitterkretsene for hver sin av de to beholdere. Ved denne løsnings- telser, is a galvanic separation of the output circuits from the common grid impulse generator. This is indicated by the fact that the output transformers 7' from this are shown with separate windings. The actual pulse generator is connected to the middle winding, while the other two windings are connected to the grid circuits for each of the two containers. By this solution
måte må man riktignok ta med på kjøpet en avflatning av impulsenes steilhet, som av hensyn til et godt paralleltarbeide av beholderne må være meget stor. Noe bedre forhold fremkommer hvis impulstransfor-matorene 7a' og 7b' kobles i serie over-ensstemmende med fig. 4. En undertryk- way, one must of course include in the purchase a flattening of the steepness of the impulses, which must be very large in order to ensure a good parallel operation of the containers. Somewhat better conditions arise if the impulse transformers 7a' and 7b' are connected in series in accordance with fig. 4. A suppressor-
kelse av impulser i tilfelle av at gitter- generation of impulses in the event that grid-
vernet reagerer, kan skje ved hjelp av kontakten 12. protection reacts, can be done using contact 12.
Claims (6)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE14411/64A SE322901B (en) | 1964-11-30 | 1964-11-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
NO119963B true NO119963B (en) | 1970-08-03 |
Family
ID=20299059
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO160665A NO119963B (en) | 1964-11-30 | 1965-11-29 |
Country Status (14)
Country | Link |
---|---|
JP (2) | JPS4920382B1 (en) |
AT (1) | AT301865B (en) |
BE (1) | BE671537A (en) |
BR (1) | BR6575332D0 (en) |
CH (1) | CH442710A (en) |
DE (1) | DE1479152B2 (en) |
DK (1) | DK125683B (en) |
ES (1) | ES319020A1 (en) |
FI (1) | FI44705C (en) |
FR (1) | FR1455510A (en) |
GB (1) | GB1119176A (en) |
NL (1) | NL148825B (en) |
NO (1) | NO119963B (en) |
SE (1) | SE322901B (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4062357A (en) * | 1974-04-08 | 1977-12-13 | Laerdal A S | Respirator mask |
DE2720448C2 (en) * | 1977-05-06 | 1981-09-24 | Rainer 3530 Warburg Fischer | Device for the production of plastic hollow bodies |
JPS5757089U (en) * | 1980-09-22 | 1982-04-03 | ||
JPS5887288U (en) * | 1981-12-10 | 1983-06-13 | 日産自動車株式会社 | Low frequency induction heating device |
GB8828481D0 (en) * | 1988-12-06 | 1989-01-05 | Euro Matic Ltd | Date coding play balls |
US5253995A (en) * | 1989-09-28 | 1993-10-19 | Caro Manufacturing Corporation | Apparatus for making a pulse dampener |
US5562429A (en) * | 1989-09-28 | 1996-10-08 | Caro Manufacturing Corporation | Pulse dampener and fuel pump having same |
EP2781329B1 (en) | 2007-01-22 | 2017-10-25 | ResMed R&D Germany GmbH | Method for manufacturing a hollow structure |
US20090152774A1 (en) * | 2007-12-17 | 2009-06-18 | Nike, Inc. | Method For Molding A Fluid-Filled Structure |
EP2411201B1 (en) * | 2009-03-24 | 2013-11-13 | Sarong Societa' Per Azioni | Apparatus and method for thermoforming objects and objects so obtained |
JP5501116B2 (en) * | 2010-06-28 | 2014-05-21 | 本田技研工業株式会社 | Blow molding method |
GB201119175D0 (en) | 2011-11-07 | 2011-12-21 | Sony Corp | Context adaptive data encoding |
JP6430389B2 (en) * | 2013-10-15 | 2018-11-28 | 日精エー・エス・ビー機械株式会社 | Preform handling apparatus and blow molding apparatus |
-
1964
- 1964-11-30 SE SE14411/64A patent/SE322901B/xx unknown
-
1965
- 1965-10-19 CH CH1450565A patent/CH442710A/en unknown
- 1965-10-20 GB GB44359/65A patent/GB1119176A/en not_active Expired
- 1965-10-20 AT AT951865A patent/AT301865B/en not_active IP Right Cessation
- 1965-10-21 DE DE19651479152 patent/DE1479152B2/en not_active Ceased
- 1965-10-26 FI FI652554A patent/FI44705C/en active
- 1965-10-28 ES ES0319020A patent/ES319020A1/en not_active Expired
- 1965-10-28 BE BE671537D patent/BE671537A/xx not_active IP Right Cessation
- 1965-10-29 DK DK556765AA patent/DK125683B/en unknown
- 1965-11-09 FR FR37820A patent/FR1455510A/en not_active Expired
- 1965-11-16 NL NL656514848A patent/NL148825B/en not_active IP Right Cessation
- 1965-11-29 NO NO160665A patent/NO119963B/no unknown
- 1965-11-30 JP JP40073211A patent/JPS4920382B1/ja active Pending
- 1965-11-30 BR BR175332/65A patent/BR6575332D0/en unknown
-
1969
- 1969-08-19 JP JP44065624A patent/JPS5130110B1/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
DE1479152B2 (en) | 1971-04-15 |
JPS4920382B1 (en) | 1974-05-24 |
DK125683B (en) | 1973-03-26 |
ES319020A1 (en) | 1966-04-16 |
SE322901B (en) | 1970-04-20 |
NL148825B (en) | 1976-03-15 |
CH442710A (en) | 1967-08-31 |
FR1455510A (en) | 1966-04-01 |
NL6514848A (en) | 1966-05-31 |
BR6575332D0 (en) | 1973-06-14 |
JPS5130110B1 (en) | 1976-08-30 |
DE1479152A1 (en) | 1971-04-15 |
FI44705B (en) | 1971-08-31 |
GB1119176A (en) | 1968-07-10 |
FI44705C (en) | 1971-12-10 |
BE671537A (en) | 1966-02-14 |
AT301865B (en) | 1972-09-25 |
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