US2661537A - Equipment for treating teeth by means of finely powdered materials carried by a stream of gas - Google Patents

Equipment for treating teeth by means of finely powdered materials carried by a stream of gas Download PDF

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Publication number
US2661537A
US2661537A US144324A US14432450A US2661537A US 2661537 A US2661537 A US 2661537A US 144324 A US144324 A US 144324A US 14432450 A US14432450 A US 14432450A US 2661537 A US2661537 A US 2661537A
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United States
Prior art keywords
gas
valve
equipment
pressure
conduit
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Expired - Lifetime
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US144324A
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English (en)
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Robert C Angell
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Individual
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Individual
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Priority to NL6809592.A priority Critical patent/NL159158B/xx
Application filed by Individual filed Critical Individual
Priority to US144324A priority patent/US2661537A/en
Priority to GB3466/51A priority patent/GB722254A/en
Priority to DEB13740A priority patent/DE889964C/de
Priority to FR62557D priority patent/FR62557E/fr
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Publication of US2661537A publication Critical patent/US2661537A/en
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2422—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using acoustic or microwave tags
    • G08B13/2425—Tag deactivation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C3/00—Dental tools or instruments
    • A61C3/02—Tooth drilling or cutting instruments; Instruments acting like a sandblast machine
    • A61C3/025—Instruments acting like a sandblast machine, e.g. for cleaning, polishing or cutting teeth

Definitions

  • This invention relates to the art of dentistry and is more particularly concerned with the provision of equipment for cutting, excavating, polishing or cleaning teeth by means of finely powdered materials carried by a stream of gas.
  • I will refer to all of these various operations broadly as treating procedures.
  • a typical example is disclosed in the copending application of Robert B. Black, Serial No. 78,068, filed February 24, 1949, said Black being the assignee of the invention disclosed herein.
  • the vibrating equipment shown in the application referred to is particularly well adapted for use in and has been incorporated as a component part of the equipment claimed herein.
  • the principal objects of the invention are to provide equipment for treating teeth by means of finely powdered materials'carried by a stream of gas wherein immediate and prompt response to the needs of the operator is always insured; wherein any one of a plurality of powdered materials may be employed depending upon the nature of the treatment required; wherein the proper material for any given operation may be quickly and easily selected without the necessity for replacing any parts and without need for any particular adjustments in the equipment; wherein the equipment may be cleaned or purged of one type of powdered material before another is introduced; wherein the feed of one materialmay be positively and abruptly discontinued when another is required so as to avoid clogging of the lines; wherein means are provided for feeding the powdered material into the stream of gas, which means are under the primary control of the pressure in the gas line and are constructed and arranged to be inoperative unless a predetermined minimum pressure exists in said line; wherein a shut-oif valve is provided in the conduit which carries the stream of gas and powder to the nozzle which directs it against the tooth, which shut-01f valve
  • the handpiece Ill is the part which the dentist holds in his hand in performing whatever treatment the patients teeth Inayrequire.
  • the details of this handpiece form no part of the invention claimed herein so they are not illustrated except that it should be noted that the mixed stream of gas and powdered material passes through the handpiece and is discharged or delivered through a very fine nozzle l l.
  • the structure of this handpiece is preferably of the type illustrated in the copending applications of Dr. Robert B. Black, Serial Nos. 78,068 and 126,311 filed, respectively, on February 24, 1949, and November 9, 1949. v
  • the gas (preferably carbon dioxide) which fcarries the powdered material comes from any suitable source or reservoir as, for instance, the
  • a cylinder of carbon dioxide such as is suitable for the purposes of the present invention often carries a pressure in the neighborhood of 800 pounds per square inch at room temperature and this pressure is maintained as long as there is anyv liquid carbon dioxide left in the cylinder.
  • This pressure is too high for the purposes of my invention so I introduce a pressure regulator l5 at a point just beyond the cylinder shut-off valve ll.
  • a gauge [8 for indicating the pressure may be connected to the pressure regula tor I5 if desired.v V
  • a cutting TDOWdBI is carried ainaa reservoir :01
  • mixer 22 fanii a.cleaningipowderzinzanother exacti ly similar mixer 23.
  • mixers 22 and 23 are exactly the same, only one of them (23) with its associated equipment will be described in detail.
  • Each mixer consists essentially of a container having a hopper-like bottom portion 24 which delivers through a perforated-plate s25.-.into the mixing chamber proper 2-6,.the plate '25 being provided with a series of small apertures suitable for this purpose in the manner described more fully in the copending application of Dr. Black, Serial No. 78;068,;referred to above.
  • Qne side-ofthe passage I30 delivers the gas to 'the small mixing chamber 26 and the mixture of gas and powder isssubsequently conveyed through the dtherside of the passage I30 to the junction point 45. and .from .there to the handpiece ID in the manner already described.
  • Both sides of :thespassage I30, 1. e., the side which leads to the mixing chamber 26 and the side which carries the mixture away :from [the c-chamber; 2Z6, are-.seither .closed :oruopened simultaneously .by .means pf :31
  • .microswitoh29 is open .sothat .no current scan new to the electromagnetic device .30.
  • the electromagnetic .-.deviee:.-3 l1 when zactuated, wibrates the table and with .it .the eontainerza This causes -.the, powder.-in ⁇ the icon- ;tainer23 toialidownthrough-the apertured plate 25 into the mixing chamber 26 where it is. -.picked up by the gas as it ztlows .-.thr.oug-h the passage J30.
  • the container 423 is air-tight :and :is sealed .at .the top by-meansof-.alcovertorscap plate .3-3-which may he threaded or otherwisemseoured.againstla eooperatinggasketst.
  • I-Ilie cover .may -be revmoved .wihen .-it.is-.desired to refill .the container .23 .and whenthis is done, .pressure :within the container .can be reduced to atmospheric .pres- .sureby opening the ,pinchvalve;3.5 whichrcontrols the bleed-riff piP-e 35. Of .-course .the .closure leap .33. should. not .be removed .until :such time .-,as .the pinch valve .-2J..closes vthe -passage .1 3c.
  • the by-pass 53a is controlled by a pinch valve 40 which is biased to closed position by a spring 4
  • the pinch valves 21, 2'! and 46 are controlled by means of a selector valve 43 having a cam surface 43 adapted to be rotated 50 as to engage one only of said pinch valves at a time.
  • the cam 43 In the position shown in the drawing the cam 43 is shown in the position it occupies when it holds the valve 21' in its opened position, thus leaving the other two valves, namely, 21 and 40 in their closed positions.
  • the micro switch 29' With the selector valve opening the pinch valve 2?, the micro switch 29' is closed so that current can flow to the electromagnetic device 30 which vibrates the table 3 l and the container 22 resting thereupon.
  • Cutting powder will then' be fed into the mixing chamber (not shown but exactly like the chamber 26) where it will be picked up by the gas entering through the passage [3b to be carried to the handpiece I0.
  • pinch valve 45 for controlling the passage through the conduit l3.
  • This pinch valve should be located as close to the handpiece as is practical so as to reduce the length of conduit l3 which extends between the pinch valve 44 and the handpiece H) to as short a dimension as possible. This will reduce the amount of powder in the conduit l3 between 44 and H to the lowest possible figure when the pinch valve 44 is closed'so that, upon reopening the pinch valve, there will be no tendency to suddenly discharge a large quantity or slug of inert powder which would otherwise be present from the previous use of the equipment.
  • the pinch valve 44 is normally biased to closed position by the spring 45 and the valve is opened when the solenoid 46 is energized.
  • the equipment so far described is electrically actuated and controlled in the following way.
  • Current is supplied throug the customary 110 v. A. C. line 61-48, there being a main switch 49 for closing and opening the circuit which leads to the equipment.
  • the switch 2 la will be closed whereupon current will reach the dentists foot switch 50 through the line lla when the main switch 59 is closed.
  • the current After passing the foot switch the current reaches the solenoid '46 through the wire 5
  • the circuit is completed to the other vibrator 30 in the following way, the micro switch 29 being closed under this condition.
  • Current flows through the wire 59 to the vibrator 30 and then through the wire 60 to the switch 29 and from the switch 29 through the wire 6
  • a volt meter 62 is connected across the circuits for the vibrators by means of the wires 63 and 64 and the voltage across the vibrator circuits can be controlled by means of the rheostat 56.
  • the rectifier 57 provides a pulsating direct current to the vibrators at a frequency of 3600 per minute on cycle current and I have found it advisable to employ such a rectifier because without it the frequency (namely, 7200) would be too high for best operation in the feeding of the powder into the stream of gas.
  • the equipment is operated in the following manner. With the gas valve I! open so that pressure will be supplied to the systom the dentist will see that hand actuated pinch valve 29 is either open or closed in accordance with the maximum pressure which he expects to require for the dental treatment under consideration. With the valve 20 open the regulator 55 will be effective and, in accordance with the examples given earlier in this description, this is set to pass a pressure of from to pounds. If less pressure is desired, the valve 20 is closed whereupon the regulator I9 takes over and con trols the pressure to a maximum. of sixty-five to seventy-five pounds per square inch.
  • the dentist will also have to select the type of powder with which he wishes to work and this is done by turning the selector control valve 43 so as to open one or the other of the pinch valves 21 and 21. If a cutting operation is to be performed the valve 21' is opened by moving the cam 43 into the position shown in the drawing. At the same time the switch 29 is closed so that the current can reach the vibrator 33' whereupon the powder in the mixer 22 will be fed into the line l3b.
  • the pinch valve 54 will be opened so that the mixture of gas and powder can be delivered to the handpiece l8 and ultimately to the nozzle I I which directs the stream against the tooth.
  • the dentist requires ;moreor less of the cutting powder he can regulate the quantity which is fed to the'st-ream of gas by -means of "the -rheostat 5.6.
  • the selectorcontrol valve .43 can open only'one of the .pinch valves 2'1, 21 andMLat atime and further that when any one of these threeis open, .the other two are always closed. This-prevents any .;possibility of powder from the wrong container ,fiowing to the nozzle ,1] andiin this connection it is important that both :sides of the conduit leading to each of the powder containers should be closed when-such container is not use and also that the vibrator forsuch container .should .be inactivated when its powder is not required.
  • Equipment for treating teeth by means .of finelypowdered materials carried by a streamof gas, comprising, in combination with a source -of compressed gas, a-nozzle, conduit means connecting the gas source with the nozzle, at least two containers for holding powdered treating :material, means for delivering material from each container into said conduit means, said material delivery means including a normally inactive vibrator for each container, a valve nor- :mally closing the conduit means on the nozzle :side of the delivery means, means for conditioning one vibrator at a time for activation, and means for opening the conduit-valve and simultaneously effecting activation of-the conditioned vibrator.
  • Equipment according to claim 1 having in addition, a conduit for by-passing :gas around :said zdelivery means swithzaqcontrol valve ithere- :ior whereby ,to clear lone powder irom the nozzle before another is introduced.
  • Equipment for treating iteeth by means of finely powdered materials-carried by .a stream 01 gas, comprising, in -,combination with a 'source- .of compressed. gas, a-nozzle, apluralityof containers for powdered materials, conduit means including passages .in arallel ;for connecting the gas.
  • qdeliveryme ansincludes a vihratortfor the container :theoperation of which js,.discontinued when :said valve means sis closed.
  • Equipment iorztreating'teeth by meanswof finely powdered materials carriedibysa streamrof gas comprising, in 'eombinationwithaa source of compressed gas, a nozzle, a conduit connecting References Cited in the file of this patent the gas source with the nozzle, a container for UNITED STATES PATENTS holding powdered material, means for delivering material from th container into said conduit, Number Name Date said delivery means including electro-magneti- 5 11664369 Maurer Man 1928 cally actuated means for vibrating the container, 1,390,164 Rosenberger 6, 1932 a switch for controlling the current for said 1953091 Westberg et a1 APR 3, 1934 electro-magnetically actuated vibrating means, FOREIGN PATENTS and means adapted to close said switch when Number Country Date the pressure in the conduit exceeds a predeter- 10 525,444 France June 6, 1921 mined standard.

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  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Veterinary Medicine (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
US144324A 1950-02-15 1950-02-15 Equipment for treating teeth by means of finely powdered materials carried by a stream of gas Expired - Lifetime US2661537A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL6809592.A NL159158B (nl) 1950-02-15 Nagelplaat voor het verbinden van houten bouwelementen.
US144324A US2661537A (en) 1950-02-15 1950-02-15 Equipment for treating teeth by means of finely powdered materials carried by a stream of gas
GB3466/51A GB722254A (en) 1950-02-15 1951-02-13 Improvements relating to dental apparatus
DEB13740A DE889964C (de) 1950-02-15 1951-02-14 Zahnmedizinische Vorrichtung
FR62557D FR62557E (fr) 1950-02-15 1952-03-04 Nouveau relais statique à cristal pour liaison radio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US144324A US2661537A (en) 1950-02-15 1950-02-15 Equipment for treating teeth by means of finely powdered materials carried by a stream of gas

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US2661537A true US2661537A (en) 1953-12-08

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US144324A Expired - Lifetime US2661537A (en) 1950-02-15 1950-02-15 Equipment for treating teeth by means of finely powdered materials carried by a stream of gas

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US (1) US2661537A (de)
DE (1) DE889964C (de)
FR (1) FR62557E (de)
GB (1) GB722254A (de)
NL (1) NL159158B (de)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748538A (en) * 1954-04-01 1956-06-05 Becton Dickinson Co Hypodermic needle and cannula cleaning apparatus
US2825135A (en) * 1956-01-10 1958-03-04 William F Tilden Self-contained abrasive applicator
US2875521A (en) * 1954-09-16 1959-03-03 Paul J Tascher Abrasive flux and flush control system for dental apparatus
US3106021A (en) * 1957-06-18 1963-10-08 John V Borden Control unit for dental handpieces
US3213537A (en) * 1954-12-24 1965-10-26 Cavitron Corp Supply and control apparatus for vibratory cutting device
US3971136A (en) * 1974-05-16 1976-07-27 Madsen Erik H Hygienic spray apparatus
US4487582A (en) * 1983-02-18 1984-12-11 Cooper Lasersonics, Inc. Dental cleaning system
WO1993010718A2 (en) * 1991-12-06 1993-06-10 American Dental Laser, Inc. Dental air abrasive system
WO1993019685A1 (en) * 1992-03-27 1993-10-14 American Dental Technologies, Inc. Dental treatment system
US5334016A (en) * 1992-06-22 1994-08-02 American Dental Technologies, Inc. Combination air abrasive system and laser system for dental applications
US5350299A (en) * 1992-03-27 1994-09-27 American Dental Technologies, Inc. Dental treatment system
US5525058A (en) * 1992-03-27 1996-06-11 American Dental Technologies, Inc. Dental treatment system
WO1996035390A1 (en) * 1995-05-09 1996-11-14 Danville Engineering, Inc. Air abrasive particle apparatus
US5591064A (en) * 1995-06-30 1997-01-07 Church & Dwight Co., Inc. Blasting apparatus and method for blast cleaning a solid surface
US5618177A (en) * 1995-05-08 1997-04-08 Dove Systems, Inc. Arrangement for feeding pressurized particulate material
US5941702A (en) * 1998-02-03 1999-08-24 Parkell Products, Inc. Air-abrading tool
US5967779A (en) * 1997-10-17 1999-10-19 Dentsply Research & Development Corp. Abrasion hand piece for use with abrasion system
US6106288A (en) * 1997-10-17 2000-08-22 Dentsply Research & Development Corp. Air abrasion system for use in dental procedures
US6186783B1 (en) 1997-10-17 2001-02-13 Dentsply Research & Development Corp. Evacuation hand piece for use during dental procedures
US6457974B1 (en) 1999-11-18 2002-10-01 Parkell, Inc. Intraoral dental abrading instrument
US6485303B1 (en) 1999-11-18 2002-11-26 Parkell, Inc. Intraoral dental abrading instrument
US6626668B2 (en) * 2001-01-05 2003-09-30 Kaltenbach & Voigt Gmbh & Co. Medical or dental-medical apparatus having a delivery line for a liquid
US20040197731A1 (en) * 2003-03-27 2004-10-07 Swan Keith Daniel Dental abrasive system using helium gas
US6884069B2 (en) 2001-07-12 2005-04-26 The Gillette Company Oral care device
US8444416B2 (en) 2005-04-26 2013-05-21 Braun Gmbh Valves for personal care devices
US8458841B2 (en) 2007-06-20 2013-06-11 Braun Gmbh Brush head for a toothbrush
WO2016142272A1 (de) * 2015-03-06 2016-09-15 Ferton Holding S.A. Pulverstrahlgerät

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR525444A (fr) * 1920-10-01 1921-09-22 Cie Parisienne De L Air Compri Distributeur pour sableuse
US1664369A (en) * 1924-06-18 1928-03-27 Maurer Jakob Process and device for operating upon human teeth
US1890164A (en) * 1931-04-21 1932-12-06 Pangborn Corp Sand blasting method and apparatus
US1953091A (en) * 1932-06-08 1934-04-03 Gustave Edward Westberg Concrete conveying and mixing machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR525444A (fr) * 1920-10-01 1921-09-22 Cie Parisienne De L Air Compri Distributeur pour sableuse
US1664369A (en) * 1924-06-18 1928-03-27 Maurer Jakob Process and device for operating upon human teeth
US1890164A (en) * 1931-04-21 1932-12-06 Pangborn Corp Sand blasting method and apparatus
US1953091A (en) * 1932-06-08 1934-04-03 Gustave Edward Westberg Concrete conveying and mixing machine

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748538A (en) * 1954-04-01 1956-06-05 Becton Dickinson Co Hypodermic needle and cannula cleaning apparatus
US2875521A (en) * 1954-09-16 1959-03-03 Paul J Tascher Abrasive flux and flush control system for dental apparatus
US3213537A (en) * 1954-12-24 1965-10-26 Cavitron Corp Supply and control apparatus for vibratory cutting device
US2825135A (en) * 1956-01-10 1958-03-04 William F Tilden Self-contained abrasive applicator
US3106021A (en) * 1957-06-18 1963-10-08 John V Borden Control unit for dental handpieces
US3971136A (en) * 1974-05-16 1976-07-27 Madsen Erik H Hygienic spray apparatus
US4487582A (en) * 1983-02-18 1984-12-11 Cooper Lasersonics, Inc. Dental cleaning system
WO1993010718A2 (en) * 1991-12-06 1993-06-10 American Dental Laser, Inc. Dental air abrasive system
WO1993010718A3 (en) * 1991-12-06 1993-07-08 American Dental Laser Inc Dental air abrasive system
US5759031A (en) * 1991-12-06 1998-06-02 American Dental Technologies, Inc. Dental air abrasive and laser system
US5752829A (en) * 1991-12-06 1998-05-19 American Dental Technologies, Inc. Dental air abrasive system
US5334019A (en) * 1991-12-06 1994-08-02 American Dental Technologies, Inc. Dental air abrasive system
AU680811B2 (en) * 1991-12-06 1997-08-14 American Dental Laser, Inc. Dental air abrasive system
US5746596A (en) * 1992-03-27 1998-05-05 American Dental Technologies, Inc. Dental treatment method
US5350299A (en) * 1992-03-27 1994-09-27 American Dental Technologies, Inc. Dental treatment system
US5330354A (en) * 1992-03-27 1994-07-19 American Dental Technologies, Inc. Dental treatment system
WO1993019685A1 (en) * 1992-03-27 1993-10-14 American Dental Technologies, Inc. Dental treatment system
US5525058A (en) * 1992-03-27 1996-06-11 American Dental Technologies, Inc. Dental treatment system
US5334016A (en) * 1992-06-22 1994-08-02 American Dental Technologies, Inc. Combination air abrasive system and laser system for dental applications
US5618177A (en) * 1995-05-08 1997-04-08 Dove Systems, Inc. Arrangement for feeding pressurized particulate material
US5984677A (en) * 1995-05-09 1999-11-16 Danville Engineering Air abrasive particle apparatus
WO1996035390A1 (en) * 1995-05-09 1996-11-14 Danville Engineering, Inc. Air abrasive particle apparatus
US5718581A (en) * 1995-05-09 1998-02-17 Danville Manufacturing, Inc. Air abrasive particle apparatus
US5591064A (en) * 1995-06-30 1997-01-07 Church & Dwight Co., Inc. Blasting apparatus and method for blast cleaning a solid surface
US6106288A (en) * 1997-10-17 2000-08-22 Dentsply Research & Development Corp. Air abrasion system for use in dental procedures
US6186783B1 (en) 1997-10-17 2001-02-13 Dentsply Research & Development Corp. Evacuation hand piece for use during dental procedures
US5967779A (en) * 1997-10-17 1999-10-19 Dentsply Research & Development Corp. Abrasion hand piece for use with abrasion system
US5941702A (en) * 1998-02-03 1999-08-24 Parkell Products, Inc. Air-abrading tool
US6457974B1 (en) 1999-11-18 2002-10-01 Parkell, Inc. Intraoral dental abrading instrument
US6485303B1 (en) 1999-11-18 2002-11-26 Parkell, Inc. Intraoral dental abrading instrument
US6626668B2 (en) * 2001-01-05 2003-09-30 Kaltenbach & Voigt Gmbh & Co. Medical or dental-medical apparatus having a delivery line for a liquid
US6884069B2 (en) 2001-07-12 2005-04-26 The Gillette Company Oral care device
US20040197731A1 (en) * 2003-03-27 2004-10-07 Swan Keith Daniel Dental abrasive system using helium gas
US8444416B2 (en) 2005-04-26 2013-05-21 Braun Gmbh Valves for personal care devices
US8458841B2 (en) 2007-06-20 2013-06-11 Braun Gmbh Brush head for a toothbrush
WO2016142272A1 (de) * 2015-03-06 2016-09-15 Ferton Holding S.A. Pulverstrahlgerät
CN107427337A (zh) * 2015-03-06 2017-12-01 福尔顿控股公司 粉末喷吹装置
JP2018510692A (ja) * 2015-03-06 2018-04-19 フェルトン ホールディング ソシエテ アノニムＦｅｒｔｏｎ Ｈｏｌｄｉｎｇ ＳＡ 粉末ブラスト処理装置
CN107427337B (zh) * 2015-03-06 2020-08-25 福尔顿控股公司 粉末喷吹装置及用于粉末喷吹装置的接合单元
US11109943B2 (en) 2015-03-06 2021-09-07 Ferton Holding S.A. Powder-blasting device

Also Published As

Publication number Publication date
FR62557E (fr) 1955-06-15
GB722254A (en) 1955-01-19
NL159158B (nl)
DE889964C (de) 1953-09-14

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