DE750722C - Elektrisches Entladungsgefaess, dessen Wandung aus einem hocherweichenden, mindestens 80 % Kieselsaeure und Aluminiumoxyd sowie Erdalkalien, einschliesslich Berylliumoxyd, enthaltenden, alkalifreien Glas besteht - Google Patents

Elektrisches Entladungsgefaess, dessen Wandung aus einem hocherweichenden, mindestens 80 % Kieselsaeure und Aluminiumoxyd sowie Erdalkalien, einschliesslich Berylliumoxyd, enthaltenden, alkalifreien Glas besteht

Info

Publication number
DE750722C
DE750722C DEP76706D DEP0076706D DE750722C DE 750722 C DE750722 C DE 750722C DE P76706 D DEP76706 D DE P76706D DE P0076706 D DEP0076706 D DE P0076706D DE 750722 C DE750722 C DE 750722C
Authority
DE
Germany
Prior art keywords
alkali
silica
wall
well
electric discharge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DEP76706D
Other languages
English (en)
Inventor
Walter Dr Haenlein
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to DEP76706D priority Critical patent/DE750722C/de
Priority to GB4204/38A priority patent/GB504062A/en
Priority to US229330A priority patent/US2252466A/en
Application granted granted Critical
Publication of DE750722C publication Critical patent/DE750722C/de
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/06—Glass compositions containing silica with more than 90% silica by weight, e.g. quartz
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B17/00—Water-tube boilers of horizontally-inclined type, e.g. the water-tube sets being inclined slightly with respect to the horizontal plane
    • F22B17/10—Water-tube boilers of horizontally-inclined type, e.g. the water-tube sets being inclined slightly with respect to the horizontal plane built-up from water-tube sets in abutting connection with two sectional headers each for every set, i.e. with headers in a number of sections across the width or height of the boiler
    • F22B17/12—Water-tube boilers of horizontally-inclined type, e.g. the water-tube sets being inclined slightly with respect to the horizontal plane built-up from water-tube sets in abutting connection with two sectional headers each for every set, i.e. with headers in a number of sections across the width or height of the boiler the sectional headers being in vertical or substantially vertical arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
    • F22B21/34—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/26—Steam-separating arrangements
    • F22B37/28—Steam-separating arrangements involving reversal of direction of flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/0041—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for only one medium being tubes having parts touching each other or tubes assembled in panel form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/302—Vessels; Containers characterised by the material of the vessel
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2201/00—Glass compositions
    • C03C2201/06—Doped silica-based glasses
    • C03C2201/08—Doped silica-based glasses containing boron or halide
    • C03C2201/10—Doped silica-based glasses containing boron or halide containing boron
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2201/00—Glass compositions
    • C03C2201/06—Doped silica-based glasses
    • C03C2201/30—Doped silica-based glasses containing metals
    • C03C2201/32—Doped silica-based glasses containing metals containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2201/00—Glass compositions
    • C03C2201/06—Doped silica-based glasses
    • C03C2201/30—Doped silica-based glasses containing metals
    • C03C2201/40—Doped silica-based glasses containing metals containing transition metals other than rare earth metals, e.g. Zr, Nb, Ta or Zn
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2201/00—Glass compositions
    • C03C2201/06—Doped silica-based glasses
    • C03C2201/30—Doped silica-based glasses containing metals
    • C03C2201/54—Doped silica-based glasses containing metals containing beryllium, magnesium or alkaline earth metals
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2203/00—Production processes
    • C03C2203/10—Melting processes

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Glass Compositions (AREA)

Description

(RGBL Π S. 150)
bij:
GroepJAfschr
DEUTSCHES REICH AUSGEGEBEN AM 2β JANUAR 1945
REICHSPATENTAMT
PATENTSCHRIFT
KLASSE
P76J06
Dr. Walter Hänlein in Berlin
ist als Erfinder genannt worden
Die Angabe des Patentinhabers unterbleibt (VO. vom 15.1.44 — RGBl. II S. 5)
enthaltenden, alkalifreien Glas besteht
im Höllischen Reich vom 3. Februar 193S an Patenterteilung- bekaniitfremaeht am _',=;. Mai U144
an l'*in-
h- wti π Ir hereiis vorj^e.-ohlajien. liochi-jufii-lienilc· alkalifreii· (iläser aus nK'Iir als y'"i, kieselsäure mil Zusätzen von TI ■:■'·! !•".!•'lallcalifii zn vrsohmrlzi'ii.
< ji.i-er -iii'l in iiianolieii I'Tillrn i
>U"I!f vim Ounrz für i-!vktriM.'lu·
J:i In!i.ir.sjiiT.:itt·. wii· lK-i>|)ii-Is\vris(.· l.fiichtröhn-ii. (Jiu'i-ksillji-rliDohilrucklriniin.-ii. Wr- -laiki-r- oiler Srink'rölirrii. (ilcidincliUT ■ ι. !ί,Ί.. luMiutzi /11 wiTileii. I ><.τ Ι·*ιλ\·<·ιΊ"Ιιιιιι^>j''.uiki 'livNcr (ilris<T ist ;lIkt für inaiiclic Z\\e>·!«· ii'n-li i't«;i> zu niedrig. Auch wiirili1 ν.νίιιιι«|<·ιι. ilal.i μ>ΙιΊη· alkalifrrini Kic.^'lsäur*1· .ui-i—»-!" -iiwir l'cniiT auch alkalifrric Ku-si'I-laxrr, die nur Zusätzt· von Morsäuri', lr D-iiT' Zirkon nithaltcn, dn-nso wi<yl:is im HftnVI-u· im Ut I'niständrn <Mit- \:> wunk· nun ^fftnidfii, daÜ man den KnwK"liun,i,rspuiikt derarli^vr IJIümt er-
die
I;.nt,i,rlasun,i;sni-i-
und {^j;
JiUUi; vi'nuindeni kann, wamiii man einen IVi! der zusammen mit Knlalkalk-n, fiiiscli 1 it-i.>lii*h Rervlliumoxyd. als Zu.»atz liemuzlon Tnnerde in einer Men^v mmi minde-u-n> o._>(l n duivh Zirkonoxvd oder 'l'horiumoxyd oder Ix'idv er ■»i'tzt. I )]<· Summe aus l'mienle und Zirkon oxyd oder lOnerde und Thoriumoxwl nder von allen drei Komponenten zusammen lan" jedoch nieht mehr als das lheifaelK1 de> liehaltes an Hrdalkalien l>eirai,ren. Ferner >oil hei {jorinfieiii (iehalt an Zirkonoxyil und oder ΊΊιοπ'ιιΐιιοχνιΙ. d.h. al>o /. H. hei einem < iehalt von 1 ",-(, au die.xeü heideii Stoffen zusammen, die Tonerde keinesfalls das Doppelte des (Jelialles an Kidalkali .hIktsoIi reiten. Setzt man derartigen liliiserti. um ihre Hearhei-

Claims (1)

  1. ιιι.υ«.ι·:.^ι n-ohafivn vor der Flamme rl was zu •rluv^-vT!!. I'iorsäuR· zn, >■> soll (Kt (idiall ι K.>rs.r.uv S"„ iiirlu ülierstei^cn und im eri^K r.'h /:i:· Sumiiu· der Komponenten Ton- ·Κ·. !'!"kiii!ii\\ 1 und Thop'umowd nielit kleiner als halb so groß, al>er auch niVlii höher ;ils tloppt·!t so groß sein.
    Πίι- folgende TaIx-He zci.LTt Ίκ· Zusamme;' set/.ung einiger filter (il;iser im 1 ihre F.igenschaften:
    ι. ■Μ..·". '' ■ 5
    ( I ^     •S5·"" ,.     ( I ii(i,ο" (, .-;·"
    "ό
    I ο     Ι."
    Ι."
    "■5
    ι O1S=;     4 ?
    Ι."
    > ( ι         ι ». . . 4ό
    '.ο     "ο
    "·5
    "ό
    I I Ό     JlL1M. Ι.ι.     .(I. I.ο
    1.(1
    "Ö
    I K)O     ■' 5     it > JI(IO Ι< ·Ι' I I ( ι ι ι ( I -> : ;: '/«■:; ϊί ι
    :.:. : ;1;\;t!ifrei w ir 1 liier'n-i ^nui !.»ät/Jicli >::i:: ie::. ·;πί.Ί !ΐι"ΐι"1ι^κ·π> \ ei"nireini{,ruiii,ren
    1 :' ι>*·~ a:: Alkali im I l'H"'i>tln.-tra^ von ",. :::;.-- -in 1.
    11A τ ic χ τ λ x s p R C ciiE:
    ". ";\k:---ohe- Kntla'hniLr-^eial.i. ·Κ·>μ·ιι ^ ..·' !:::;l; ;r.-.- einem !i>n.'iKT\ven."iu'ii(len. ■;:■" "\.->:e:> ^"" » K'-i"-el-«;iiir«.· 1111Ί Alur:.:::::::v.ii\\ ·! Miwii· l-'riialkaiien. ein- -■■'.!:o: ■!:>':: I'n i"\ lliimii >x\ Ί. i-n thai ten den, ..'k;."i-''\-:\:: ' Ila-e l)e>teii;. la lurch ^e-',.■;■:■ ;·:.·':ϋι·:. ιIaM Ίι·ηι t ϊin.— Zirkonowl ·:::'■·:.··■ ! :r .ri:imi >\\ Ί :':: -nlolien o.j"u ■·.'*. · -!--'^enar:: Menzel! /.-.;,i,re-el/.l sind. ':.. -·.·:: ·:ιτ ι lelinli an \L()..-- Zr( ).2 ο ler \:_.( '.. · 'PM ). .i'Ut .\!;( J.·, - ZrO2 · 'HiO2 /.: !ι·::: ■ iiviai; an Im'!alkali j^vu ieliis-■..:.·:- -K.-iNimal u Iv $ : ι \er]iiil'.
    :\\-k:r?s>"iii-s Kuiia i:mLr>LT^"f.iΙ.ϊ naoh '■.::-■-:■.:■·' ι. ir--cn Z; rk. >;i- . 1 ler ΊΊι· ιπ'ιηη-■ \·- ;^v- :■'.· in der ' u-Ljvn i \.<:i 1 " „ lie^i, '.:..···. -rkv-nu/.eiciuK·:. i;.ii der 1 iehalt an ICi".!alkali weiii.ysu-ii.s d\- 1 l.iiiu- K--ijeli.'ilk's de.s AIuminiumoNv.lc- a-.;vna-.-Y.. 7;,
    ,1. IClektrisches ICntIaduiii,rs^-t;i!' ü.i·"' Ans])ruch 1 oder J. ladurch irekenn'riv" net. dal.i das (ila- einen S"„ nicir. a'.-.-r steinenden Zusatz, an Ι·ι>ΐ·>η·.ι.'ν ')e>ii--t: ·."-. da!.! das \ erliidtnis der Η.ΐί^ι,ϋΐν /:: 'Wu So (iehalt an Alumiuiuniow 1. '/.·:·\<ι<·λ·>\\ und Thoriumow I weni^s-i: - 1 : _· ;::i . h'ichsteiis j : 1 betrat:!.
    Zur Abgren/.iuii,r des Annie! 'mn.u.-^ei,'«. Standes vom Stand der Technik s:r. \ :·ι; ;■ teilunpsvcrfahren folgende Ih-.ickschriiie-i l'etrachi gezogen worden:
    deutsche Patentschriften .... N":'- (·-'·' Γ
    ('47o57- -54S(14· 4s"75.i: A. Kai/. (Juar/.jilas und (Juar.-.ι,ΊΓ ■ :..:■ s -·
    Zeitschril'i: I 'ii l Iieiiiisclh· Kn'inU. ■ w.i1
    I left ■;, S. ι ,ί:
    schwci/i/nsche l'ateuisc'ini: Λ':". : _'■ Ji
    f. "ils. nrntiiTM in ih n "i u.iimhu ..ki.i
DEP76706D 1938-02-03 1938-02-03 Elektrisches Entladungsgefaess, dessen Wandung aus einem hocherweichenden, mindestens 80 % Kieselsaeure und Aluminiumoxyd sowie Erdalkalien, einschliesslich Berylliumoxyd, enthaltenden, alkalifreien Glas besteht Expired DE750722C (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DEP76706D DE750722C (de) 1938-02-03 1938-02-03 Elektrisches Entladungsgefaess, dessen Wandung aus einem hocherweichenden, mindestens 80 % Kieselsaeure und Aluminiumoxyd sowie Erdalkalien, einschliesslich Berylliumoxyd, enthaltenden, alkalifreien Glas besteht
GB4204/38A GB504062A (en) 1938-02-03 1938-02-10 Improvements in refractory glasses
US229330A US2252466A (en) 1938-02-03 1938-09-10 Glass of high softening point

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP76706D DE750722C (de) 1938-02-03 1938-02-03 Elektrisches Entladungsgefaess, dessen Wandung aus einem hocherweichenden, mindestens 80 % Kieselsaeure und Aluminiumoxyd sowie Erdalkalien, einschliesslich Berylliumoxyd, enthaltenden, alkalifreien Glas besteht

Publications (1)

Publication Number Publication Date
DE750722C true DE750722C (de) 1945-01-26

Family

ID=41351675

Family Applications (1)

Application Number Title Priority Date Filing Date
DEP76706D Expired DE750722C (de) 1938-02-03 1938-02-03 Elektrisches Entladungsgefaess, dessen Wandung aus einem hocherweichenden, mindestens 80 % Kieselsaeure und Aluminiumoxyd sowie Erdalkalien, einschliesslich Berylliumoxyd, enthaltenden, alkalifreien Glas besteht

Country Status (3)

Country Link
US (1) US2252466A (de)
DE (1) DE750722C (de)
GB (1) GB504062A (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4119760A (en) * 1975-08-15 1978-10-10 Ppg Industries, Inc. Chemical strengthening of glass
US5096857A (en) * 1990-10-22 1992-03-17 E. I. Du Pont De Nemours And Company Chemically stabilized cristobalite

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE254864C (de) *
CH120210A (de) * 1925-02-17 1927-05-16 Sidler August Verfahren zur Herstellung von Borosilikatglas.
DE480753C (de) * 1925-03-19 1929-08-07 Ludwig Hochstein Verfahren zur Herstellung eines Glases aus Kieselsaeure, Bortrioxyd, Aluminiumoxyd und Zirkonoxyd
DE629745C (de) * 1927-12-01 1936-05-09 Philips Nv Verfahren zum Zusammenschmelzen der Teile von teilweise aus Quarz und teilweise aus Glas bestehenden Gegenstaenden
DE647357C (de) * 1935-04-09 1937-07-02 Carl Schlemper Fa Samtschneidrute

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE254864C (de) *
CH120210A (de) * 1925-02-17 1927-05-16 Sidler August Verfahren zur Herstellung von Borosilikatglas.
DE480753C (de) * 1925-03-19 1929-08-07 Ludwig Hochstein Verfahren zur Herstellung eines Glases aus Kieselsaeure, Bortrioxyd, Aluminiumoxyd und Zirkonoxyd
DE629745C (de) * 1927-12-01 1936-05-09 Philips Nv Verfahren zum Zusammenschmelzen der Teile von teilweise aus Quarz und teilweise aus Glas bestehenden Gegenstaenden
DE647357C (de) * 1935-04-09 1937-07-02 Carl Schlemper Fa Samtschneidrute

Also Published As

Publication number Publication date
GB504062A (en) 1939-04-19
US2252466A (en) 1941-08-12

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