US3836394A - Method of manufacture of a conductor rail - Google Patents
Method of manufacture of a conductor rail Download PDFInfo
- Publication number
- US3836394A US3836394A US00275517A US27551772A US3836394A US 3836394 A US3836394 A US 3836394A US 00275517 A US00275517 A US 00275517A US 27551772 A US27551772 A US 27551772A US 3836394 A US3836394 A US 3836394A
- Authority
- US
- United States
- Prior art keywords
- layer
- wear
- aluminum
- conductor rail
- intermediate layer
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000004020 conductor Substances 0.000 title abstract description 28
- 238000004519 manufacturing process Methods 0.000 title abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 51
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 12
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 229910000838 Al alloy Inorganic materials 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 claims description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 4
- 238000010285 flame spraying Methods 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- 239000011135 tin Substances 0.000 claims description 4
- 229910052718 tin Inorganic materials 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 239000011701 zinc Substances 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 24
- 239000007788 liquid Substances 0.000 abstract description 7
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 150000002739 metals Chemical class 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 229910000765 intermetallic Inorganic materials 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000011344 liquid material Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- -1 i.e. Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M1/00—Power supply lines for contact with collector on vehicle
- B60M1/30—Power rails
- B60M1/302—Power rails composite
Definitions
- the present invention relates to a method of manufacture of a conductor rail, consisting of a body of aluminum or an aluminum alloy with a layer of more wearresistant material arranged on the body and forming a sliding surface.
- a conductor rail consisting of a body of aluminum or an aluminum alloy with a layer of more wearresistant material arranged on the body and forming a sliding surface.
- Such conductor rails serve for supply of energy to a device, such as a locomotive, a elevator or similar electrically driven apparatus.
- intermetallic compounds are brittle, electrically poorly conducting, and in particular the layer is not stable in its size, but continuously increases, because by means of it an electrical resistance is produced which develops heat, while its growth with rising layer thickness rapidly increases.
- the invention starts from this and has set itself the task to provide a method of manufacture of a conductor rail, the product of which shows optimum mechanical and electrical characteristics such as resistance to wear and electrical conductivity, and the task is solved by a method of manufacture of a conductor rail consisting of a body of aluminum or an aluminum alloy on which is a layer of a second material more resistant to wear in which method the second material is applied while it is in its liquid condition and simultaneously the heat content is carried away through the body.
- the invention in contrast to the teaching of the state of the art, sets out to make the most of the good thermal conductivity of the aluminum body for a deliberate forced carrying away the heat content of the layer of wear resistant material which is applied as liquid.
- the aluminum body is ready formed previously. It is coated with metal only in the places where necessary.
- deliberate forced carrying away the heat content there is to be understood the maintenance of the body temperature before application of the coating of wearresistant material, even with introduction of auxiliary means.
- the wear-resistant material can, for formation of the sliding surface, be cast, or applied by flame spraying or spray welding. It is preferred to melt the wear-resistant material in an arc and to apply it onto the aluminum body by means of a plasma jet.
- the method which is known under the term plasma spraying" for coating of turbine blades and the like has, for avoidance of intermetallic intermediate layers in the manufacture of conductor rails of material of the kind mentioned, the special advantage that locally sharply defined heat can be introduced into the aluminum body with the consequence of good removal on account of the remaining great cross sections with their favourable temperature gradients.
- the method according to the invention is furthermore advantageously carried out, in that before application of the wear-resistant material on the corresponding surface of the body, an intermediate layer is applied which has good adhesion on the body and on the wear-resistant material and hinders diffusion of the wear-resistant material into the body or vice versa, whereby the intermediate layer advantageously consists of nickel, or a nickel-aluminum alloy, of tin, zinc,
- FIG. 1 shows a sectional extrusion of aluminum intended for formation of a conductor rail 10, which consists of a box-shaped hollow section 11 and a T-section 12 connected with the box-shaped hollow section 11.
- the box-shaped hollow section 11 has three sides 13, 14, 15 suitable for pick-up of current, each of which as required carry a layer of wear-resisting material 19.
- the flange 17 is intended for mounting of the conductor rail at both sides. According to the shape or arrangement of the pick-up 18, the current flowing through the conductor rail 10 is taken up either from the side 13, the sides 13 and 14, the side 15, or combinations of them.
- the layer 19 of wear-resistant material connected to the sides l3, l4 and provides a remedy against this alteration.
- the layer 19 consists suitably of a ferrous alloy such as steel. It can however also consist of an alloy of the metals nickel, chromium, or copper, with such metals, which provides for the layer the required resistance to wear.
- the layer 19 is applied in liquid condition to the sides, 13, 14, 15 with simultaneous rapid removal of heat, to avoid the formation of an intermetallic layer of for example steel and aluminum.
- During said forced heat removal there is transfered heat from the layer to a third medium in contact with the body in such amount until the heat content of the layer is equal to that of the body and the transfer is performed so quickly that no increase in heat content of the body is noticible.
- the sides 13, 14, 15 can be cast out of the wear-resisting material, in doing which it is suitable to carry out the application layer by layer, that is to say in individually thin layers with simultaneous good distribution of the liquid material over the sides 13, 14 and 15.
- the conductor can in addition be cooled.
- Flame spraying or spray welding are similarly suitable methods for application of the wear-resistant layer 19 in liquid form, which permit an even better distribution of the liquid with simplified additional provisions such as molding means in case of casting.
- Especially good results concerning the adhesion of the applied layer 19 on the corresponding surfaces of the conductor rail 10 and with reference to as small as possible an electrical transfer resistance between each layer 19 and the conductor rail 10 are obtained, if the material of the layer 19 is applied by means of a plasma spray pistol.
- the material of the layer 19 is melted in an arc, the material being generally supplied in powder from to the are burning in the spray pistol and is conveyed under high pressure in the direction out of the spray pistol onto the conductor rail 10, by means of an ionised carrier gas supplied to the spray pistol, which can be an inert gas or also disassociated water ionised into its constituents.
- an ionised carrier gas supplied to the spray pistol which can be an inert gas or also disassociated water ionised into its constituents.
- an intermediate layer 20 which has good adhesion to the body, i.e., to the conductor rail 10 and to the layers of wear-resistant material, and which hinders diffusion of the wear-resistant material into the body or vice versa, which can consist of nickel, of a nickel-aluminum alloy, of tin, zinc, silver, copper, or alloys of these metals.
- the thickness of the intermediate layer 20, which can amount to between 51.1. and 300p, conforms substantially to the requirements of the wear-resistant layer 19, such as life with 'pre-determined coefficients of friction and frequency of rubbing operations, permissible tolerances of layer thickness, etc, which substantially call for the thickness of the layer 19.
- the lowering of thermal stresses or tensions on the ground of external influences and also those brought about by coating is further supported, in that the intermediate layer 20 has pores.
- the materials of the intermediate layer are, in a possible embodiment of the method, melted in an arc and applied by a plasma jet onto the corresponding sides 13, 14, 15, cooperating with the pick-up 18. Since these materials form no intermetallic compounds, which could disturb conduction of current, suitable considerations of manufacture, such as a rational assembly, simplification of the expenditure on apparatus etc., call for this mode of application. in addition it has appeared surprisingly that, by the application of the wear-resistant layer by means of a plasma jet, the thickness of the layer to achieve the same life as those produced according to the remaining methods, can be reduced by reason of its increased resistance to frictional wear despite the same material composition, as used for the remaining methods. Under certain conditions the wear-resistant layers produced according to the invention should subsequently be ground. The danger of a local formation of cells favouring corrosion is counteracted, in that on the narrow sides of the layers which are exposed to the surrounding atmosphere sealings can be applied.
- the layers of wear-resistant material is applied in a thickness of 0.3 to 2 mm.
- Method of manufacture of a conductor rail consisting of a body of aluminum or an aluminum alloy on which is a layer of a more resistant to wear material selected from an alloy of a metal of the group consisting of iron, nickel, chromium, and copper in which method the material is applied while it is in its liquid state, and simultaneously the heat content of the material is carried away through the body.
- the intermediate layer is of a metal selected from the group consisting of nickel, nickel-aluminum alloy, tin, zinc, silver, copper and alloys thereof.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Coating By Spraying Or Casting (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1121671A CH527488A (de) | 1971-07-29 | 1971-07-29 | Verfahren zur Herstellung einer Stromschiene |
Publications (1)
Publication Number | Publication Date |
---|---|
US3836394A true US3836394A (en) | 1974-09-17 |
Family
ID=4371212
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00275517A Expired - Lifetime US3836394A (en) | 1971-07-29 | 1972-07-27 | Method of manufacture of a conductor rail |
Country Status (4)
Country | Link |
---|---|
US (1) | US3836394A (enrdf_load_stackoverflow) |
CH (1) | CH527488A (enrdf_load_stackoverflow) |
FR (1) | FR2147317B1 (enrdf_load_stackoverflow) |
IT (1) | IT963447B (enrdf_load_stackoverflow) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5126514A (en) * | 1989-09-07 | 1992-06-30 | Delachaux S.A. | Process for producing an electrical supply rail |
EP0522955A1 (fr) * | 1991-07-09 | 1993-01-13 | Delachaux S.A. | Dispositif d'alimentation en électricité par contact avec un frotteur et procédé de réalisation d'un tel dispositif |
FR2683955A1 (fr) * | 1991-11-19 | 1993-05-21 | Delachaux Sa | Dispositif d'alimentation en electricite par contact avec un frotteur et procede de realisation d'un tel dispositif. |
WO1993009972A1 (en) * | 1991-11-13 | 1993-05-27 | Inesscon, Inc. | Power conductor rail |
US5279397A (en) * | 1991-09-28 | 1994-01-18 | Brecknell, Willis & Co. Ltd. | Conductor rails |
US5310032A (en) * | 1991-11-13 | 1994-05-10 | Plichta Dietmar G | Power conductor rail |
WO1997022491A1 (en) * | 1995-12-19 | 1997-06-26 | Howell Corporation | Composite electrical conductor rail |
US6318529B1 (en) * | 1998-11-02 | 2001-11-20 | Alusuisse Technology & Management Ltd. | Conductor rails, the use thereof and methods of manufacture |
US20060032705A1 (en) * | 2004-08-16 | 2006-02-16 | Isham William R | Lightweight composite ladder rail having supplemental reinforcement in regions subject to greater structural stress |
US20060237101A1 (en) * | 2005-04-25 | 2006-10-26 | Daido Metal Company Ltd. | High temperature sliding alloy |
US20070205053A1 (en) * | 2004-08-16 | 2007-09-06 | Isham William R | Molded composite climbing structures utilizing selective localized reinforcement |
US20080251969A1 (en) * | 2007-02-16 | 2008-10-16 | Isham William R | Bladder Molding Systems and Methods For Fabricating Composite Articles |
CN104773093A (zh) * | 2015-04-03 | 2015-07-15 | 株洲瑞泰装备技术有限公司 | 铜铝复合导电轨及其制作方法 |
CN105171436A (zh) * | 2015-09-06 | 2015-12-23 | 苏州市宝玛数控设备有限公司 | 一种切割机钢轨 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8502316D0 (en) * | 1985-01-30 | 1985-02-27 | Raychem Ltd | Electrical components |
US4985313A (en) * | 1985-01-14 | 1991-01-15 | Raychem Limited | Wire and cable |
DE29503490U1 (de) * | 1995-03-02 | 1995-04-27 | Bovender, Franz, Dipl.-Ing., 47800 Krefeld | Fahrzeugschiene mit Metallbeschichtung |
CN104439897B (zh) * | 2014-11-13 | 2017-01-25 | 苏州工业园区得意机电设备有限公司 | 利用龙门五面体数控机床加工贴片机导轨座的方法 |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US26189A (en) * | 1859-11-22 | Ditching-machine | ||
US3077659A (en) * | 1958-12-24 | 1963-02-19 | Gen Motors Corp | Coated aluminum cylinder wall and a method of making |
US3148086A (en) * | 1961-10-09 | 1964-09-08 | Philip M H Seibert | Process of placing a copper layer on an aluminum electrical connector |
US3198662A (en) * | 1962-08-20 | 1965-08-03 | Philip M H Seibert | Process of applying a silver layer on an aluminum electrical contact |
US3285680A (en) * | 1963-06-26 | 1966-11-15 | Helen G Dailey | Bearing |
US3326714A (en) * | 1964-01-08 | 1967-06-20 | Union Carbide Corp | Wear and corrosion resistant coating |
US3341669A (en) * | 1964-03-11 | 1967-09-12 | Porter Co Inc H K | Current conductor rail system |
US3349722A (en) * | 1964-11-27 | 1967-10-31 | Cleveland Technical Ct Inc | Electrical resistance rail heater |
US3602655A (en) * | 1968-10-30 | 1971-08-31 | Insul 8 Corp | Composite conductor bar and method of manufacturing |
US3674544A (en) * | 1968-12-31 | 1972-07-04 | Citroen Sa | Methods of coating surfaces and in elements comprising such surfaces |
US3679460A (en) * | 1970-10-08 | 1972-07-25 | Union Carbide Corp | Composite wear resistant material and method of making same |
US3705818A (en) * | 1968-12-31 | 1972-12-12 | Citroen Sa | Methods of coating rubbing surfaces and elements comprising such surfaces |
-
1971
- 1971-07-29 CH CH1121671A patent/CH527488A/de not_active IP Right Cessation
-
1972
- 1972-07-27 US US00275517A patent/US3836394A/en not_active Expired - Lifetime
- 1972-07-27 IT IT27519/72A patent/IT963447B/it active
- 1972-07-28 FR FR7227418A patent/FR2147317B1/fr not_active Expired
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US26189A (en) * | 1859-11-22 | Ditching-machine | ||
US3077659A (en) * | 1958-12-24 | 1963-02-19 | Gen Motors Corp | Coated aluminum cylinder wall and a method of making |
US3148086A (en) * | 1961-10-09 | 1964-09-08 | Philip M H Seibert | Process of placing a copper layer on an aluminum electrical connector |
US3198662A (en) * | 1962-08-20 | 1965-08-03 | Philip M H Seibert | Process of applying a silver layer on an aluminum electrical contact |
US3285680A (en) * | 1963-06-26 | 1966-11-15 | Helen G Dailey | Bearing |
US3326714A (en) * | 1964-01-08 | 1967-06-20 | Union Carbide Corp | Wear and corrosion resistant coating |
US3341669A (en) * | 1964-03-11 | 1967-09-12 | Porter Co Inc H K | Current conductor rail system |
US3349722A (en) * | 1964-11-27 | 1967-10-31 | Cleveland Technical Ct Inc | Electrical resistance rail heater |
US3602655A (en) * | 1968-10-30 | 1971-08-31 | Insul 8 Corp | Composite conductor bar and method of manufacturing |
US3674544A (en) * | 1968-12-31 | 1972-07-04 | Citroen Sa | Methods of coating surfaces and in elements comprising such surfaces |
US3705818A (en) * | 1968-12-31 | 1972-12-12 | Citroen Sa | Methods of coating rubbing surfaces and elements comprising such surfaces |
US3679460A (en) * | 1970-10-08 | 1972-07-25 | Union Carbide Corp | Composite wear resistant material and method of making same |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5126514A (en) * | 1989-09-07 | 1992-06-30 | Delachaux S.A. | Process for producing an electrical supply rail |
EP0522955A1 (fr) * | 1991-07-09 | 1993-01-13 | Delachaux S.A. | Dispositif d'alimentation en électricité par contact avec un frotteur et procédé de réalisation d'un tel dispositif |
FR2679065A1 (fr) * | 1991-07-09 | 1993-01-15 | Delachaux Sa | Dispositif d'alimentation en electricite par contact avec un frotteur et procede de realisation d'un tel dispositif. |
US5279397A (en) * | 1991-09-28 | 1994-01-18 | Brecknell, Willis & Co. Ltd. | Conductor rails |
WO1993009972A1 (en) * | 1991-11-13 | 1993-05-27 | Inesscon, Inc. | Power conductor rail |
US5263561A (en) * | 1991-11-13 | 1993-11-23 | Inesscon, Inc. | Power conductor rail |
US5310032A (en) * | 1991-11-13 | 1994-05-10 | Plichta Dietmar G | Power conductor rail |
FR2683955A1 (fr) * | 1991-11-19 | 1993-05-21 | Delachaux Sa | Dispositif d'alimentation en electricite par contact avec un frotteur et procede de realisation d'un tel dispositif. |
WO1997022491A1 (en) * | 1995-12-19 | 1997-06-26 | Howell Corporation | Composite electrical conductor rail |
US6318529B1 (en) * | 1998-11-02 | 2001-11-20 | Alusuisse Technology & Management Ltd. | Conductor rails, the use thereof and methods of manufacture |
US20060032705A1 (en) * | 2004-08-16 | 2006-02-16 | Isham William R | Lightweight composite ladder rail having supplemental reinforcement in regions subject to greater structural stress |
US20070205053A1 (en) * | 2004-08-16 | 2007-09-06 | Isham William R | Molded composite climbing structures utilizing selective localized reinforcement |
US20060237101A1 (en) * | 2005-04-25 | 2006-10-26 | Daido Metal Company Ltd. | High temperature sliding alloy |
US7666519B2 (en) * | 2005-04-25 | 2010-02-23 | Daido Metal Company Ltd. | High temperature sliding alloy |
US20080251969A1 (en) * | 2007-02-16 | 2008-10-16 | Isham William R | Bladder Molding Systems and Methods For Fabricating Composite Articles |
CN104773093A (zh) * | 2015-04-03 | 2015-07-15 | 株洲瑞泰装备技术有限公司 | 铜铝复合导电轨及其制作方法 |
CN104773093B (zh) * | 2015-04-03 | 2017-01-18 | 株洲瑞泰装备技术有限公司 | 铜铝复合导电轨及其制作方法 |
CN105171436A (zh) * | 2015-09-06 | 2015-12-23 | 苏州市宝玛数控设备有限公司 | 一种切割机钢轨 |
Also Published As
Publication number | Publication date |
---|---|
FR2147317A1 (enrdf_load_stackoverflow) | 1973-03-09 |
IT963447B (it) | 1974-01-10 |
FR2147317B1 (enrdf_load_stackoverflow) | 1980-08-14 |
CH527488A (de) | 1972-08-31 |
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