US3347977A - Homogeneous sodium conductor connections - Google Patents

Homogeneous sodium conductor connections Download PDF

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Publication number
US3347977A
US3347977A US510771A US51077165A US3347977A US 3347977 A US3347977 A US 3347977A US 510771 A US510771 A US 510771A US 51077165 A US51077165 A US 51077165A US 3347977 A US3347977 A US 3347977A
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US
United States
Prior art keywords
cable
cap
contact member
inner contact
contact
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
Application number
US510771A
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English (en)
Inventor
Hus Johannes
Scoran Eugene
Zurhellen Edward
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FCI USA LLC
Original Assignee
Burndy Corp
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 by Burndy Corp filed Critical Burndy Corp
Priority to US510771A priority Critical patent/US3347977A/en
Priority to GB52937/66A priority patent/GB1147039A/en
Priority to FR84951A priority patent/FR1502297A/fr
Priority to ES0333878A priority patent/ES333878A1/es
Priority to SE16235/66A priority patent/SE320718B/xx
Priority to BE690393D priority patent/BE690393A/xx
Priority to NL6616813A priority patent/NL6616813A/xx
Priority to CH1704266A priority patent/CH452645A/fr
Priority to DE19661590185 priority patent/DE1590185B1/de
Application granted granted Critical
Publication of US3347977A publication Critical patent/US3347977A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/50—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw
    • H01R4/5033—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw using wedge or pin penetrating into the end of a wire in axial direction of the wire
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S174/00—Electricity: conductors and insulators
    • Y10S174/07—Sodium conductors, connectors

Definitions

  • This invention relates to electrical connections and connectors, and has the general object of providing a simple, sturdy and effective means for establishing reliable electrical connections to electrical cables of unusual type.
  • the insulated electrical cable contemplated for use with this invention comprises a core of highly ductile conductive materials such as sodium encased within a tubular insulating jacket of strong flexible material such as commercially available polyethylene.
  • Sodium conductor cables are of significant interest to the. electrical power industry because the metal offers electrical characteristics favorably comparable to the more commonly used copper and aluminum conductors at substantially less cost. It is known, however, that certain other physical characteristics of sodium and similar conductive materials differ substantially from those of the standard cable conductors.
  • Sodium for example, is characterized by a high rate of chemical reactivity with air and Water.
  • the high duetility of the metal causes it to behave in a pseudo fiuid manner in response to unbalanced forces. Its very low tensile strength makes it a generally poor structural material.
  • connection and construction techniques for electrical contacts do not operate effectively with a conductor which cannot be welded, soldered or physically clamped in any practical manner.
  • Connections to cables of the sodium conductor type are further complicated by the necessity for protecting the conductor from exposure to air, water and other reactive elements.
  • the objects of this invention are directed toward providing reliable, inexpensive, and easily applied connectors and connection techniques for establishing secure electrical and mechanical contact with an electrical cable having a conductor formed of highly reactive and/ or highly ductile material.
  • a connector which is applied axially to the end of a cable in which a longitudinally extending inner contact member serves the dual functions of contacting the conductor and of supporting the cable shape so that it may be circumferentially gripped by an outer cap member.
  • a further feature includes the provision, in such a connector, of an exclosed space for safely capturing the cable conductor material which is extruded from the cable jacket by insertion of the contact element.
  • Yet another feature is the use of an axially insertable contact element which has a low actual physical volume in relation to the theoretical total volume enclosed within the envelope defined by the outer periphery of the contact shape.
  • One such contact element has a spiral ramp configuration which may be rotated into a ductile core material.
  • FIGURE 1 is a longitudinal cross section view of a connection formed in accordance with one embodiment of this invention.
  • FIGURE 2 is a similar view in accordance with another embodiment of this invention.
  • FIGURE 3 is an exploded cross sectional view of a connector which may be constructed in accordance with yet another embodiment of this invention.
  • FIGURE 4 is a partial transverse cross section view taken along the line 4-4 of FIGURE 3.
  • FIG- URE 1 may be seen to illustrate an electrical connector 10 secured to the end of an electrical cable 12.
  • the cable comprises a strong, flexible outer insulating jacket 14 and a soft, ductile core conductor 16.
  • the connector comprises an outer cap 18, an inner contact element 20 in the form of a helical ramp having coils represented by 20A and 20B, and an external contact element 22.
  • the cable jacket 14 is telescopically disposed within the cap 18, and the contact element 20 is seen to be embedded in conductor 16. Penetration of the contact 20 into conductor 16 is accomplished by rotating the entire connector about its own axis thereby advancing the spiral ramp shape of the contact into the conductor material in the manner of a corkscrew.
  • the pointed end 24 on the contact facilitates rotation and axial advance, while the centerless corkscrew shape of the contact advantageously minimizes displacement of the core material 16 during insertion.
  • an enclosure 28 has been provided by deliberately positioning the inner end wall of cap 13 at a short axial distance from the end of cable 12. While this positioning might be allowed for by an installer during installation, it is preferable to provide a positioning stop means, such as transverse shoulder 26, on the inner surface of the cap to assure proper spacing.
  • shoulder 26 By constructing shoulder 26 as a substantially continuous ridge around the inner periphery of the cap, it can be made to serve the purpose of an additional sealing means for securely capturing the material within space 28.
  • the inner contact member 20 of this invention it is desirable for the inner contact member 20 of this invention to maintain the shape of the outer insulating jacket 14 of the cable to which it is applied. Given this support, the connector securing means discussed later in this disclosure are better able to grip the cable periphery.
  • the desired support is achieved by providing the contact 20 with a portion having a generally uniform outermost diameter which does not differ substantially from the inner diameter of the cable jacket 14.
  • the contact 20 has been provided with five spiral turns of substantially the same diameter, extending from 20A to 208. This provides in ternal support for the jacket over a substantial portion of the total length of the contact.
  • the internal support provided by contact 20 for cable jacket 14 is of particular interest.
  • the uniform outermost diameter of the contact should preferably be very nearly the same or greater than the inner diameter of the jacket 14 so as to afford optimum support for the crimping or other compressing operation.
  • the uniform diameter portion may have substantially the same longitudinal extent as the crimped portion on the cap 18.
  • the uniform outer diameter portion of contact 20, including 20A and 203 may be seen to extend beneath both of the two axially spaced apart crimps 30, thereby affording substantial internal support to each crimp area.
  • Added axial retention strength for the connector may be derived from contact by providing relatively sharp edges or areas on the outer perihery of the spiral turns such as 20A or 20B. By proper choice of contact diameter these may be adapted to bite into the innner diameter of cable jacket 14 either upon rotation of the connector during insertion, or only in response to the slight reduction in diameter of the jacket caused by external compression.
  • FIGURE 1 shows cap 18 to be an integral conductive extension of inner contact 20 and external contact 22.
  • cap 18 is in conductive contact with contact element 20 it is apparent that the cap and the contact will each exist at the same electrical potential when the core 16 is energized. This identity of electrical potential may be utilized to reduce undesirable corona effects by causing the cap 18 to shield the contact 20, in effect.
  • contact 20 preferably should not extend beyond the end of cap 18. This concept is illustrated in FIGURE 1 by showing the end of contact 20 to be a finite distance D short of the plane defined by the end of cap 18. If the distance D is made sufficiently great to allow cap 18 to receive jacket 14 before contact end 24 engages core 16, the cap will advantageously serve as a guide to assure proper alignment of the contact with the core.
  • FIGURE 2 illustrates an embodiment of this invention in which elements having corresponding parts in FIG- URE 1 are denoted by the same reference numerals increased by one hundred.
  • cable 112 corresponds to cable 12
  • connector 110 corresponds to connector 10 in FIGURE 1.
  • inner contact element 120 is in the form of a thin-walled hollow tube having an outermost diameter adapted to permit insertion into the inner diameter of cable insulation jacket 114.
  • the forward rim of the tubular contact may be beveled, as at 124, to ease axial advance during insertion; concurrently the outermost edge of the bevel may in turn be slightly rounded, as shown, to avoid snagging on the inner wall of the jacket 114.
  • an enclosed chamber 129 has been provided to capture the displaced volume of material from conductor core 116 in a completely sealed-off space.
  • a spacing projection 126 may be provided on the outer periphery of the rearward end of contact 120 in order to create an additional enclosed volume 128 beyond the cable end.
  • This external volume serves, as in the embodiment of FIGURE 1, to capture core material which is extruded from the cable between the outer wall of contact 120 and the inner wall of jacket 114.
  • the tubular contact element 120 of FIGURE 2 provides a high ratio of theoretical enclosed volume to actual physical volume. It has been found that this ratio assures optimum cable support with minimum core material displacement.
  • FIGURE 3 illustrates another modification of this invention and suggests a convenient method of fabricating a connector in accordance with the new concepts here disclosed.
  • the connector comprises an outer cap 218, an external contact element 222, and an inner contact element 220.
  • cap 218 is formed of two separate elements: tubular side wall 217 and circular end wall 219.
  • the end wall is provided with a peripheral flange 227 which positions the end wall relative to side wall 217 and provides a convenient surface for securing the two parts together as by soldering, brazing or welding, for example.
  • the end wall 219 may be provided, in addition, with an annluar recess 228 which will communicate with the conductor core of a cable for receiving extruded core material in a space beyond the end of the cable.
  • the inner contact element in this embodiment may be seen to comprise a form of helical screw having a particular configuration. That is, the turns of the screw gradually decrease in diameter toward the forward end, but at the rearward end, they include several turns of substantially uniform outer diameter, as between 220A and 2203.
  • the central spine 231 of the contact includes a rearwardly projecting anchor portion 221. End wall 219 of cap 218 is provided with a central bore 225 which permits anchor 221 to emerge from the interior to the exterior of the cap. If desired, anchor projection 221 may be sealed in bore 225 and secured directly to end wall 219 by any suitable process. Anchor 221 might thus serve directly as an external contact for the connector. Alternatively, a separate external contact 222 may be used by providing it with a bore 223 adapted to receive anchor 221. End wall 219 may thus be gripped between contact 222 and the rearward end of contact 220 to secure the latter to cap 218.
  • cap 218 may in fact be formed of any suitable metallic or synthetic material and may possibly be formed of the same material as the insulating jacket of the cable to which it is attached. Similarly, the cap may be formed of a conductive material with an insulating coating provided to limit the amount of conductive surface area presented by the connector.
  • the outer caps of connectors constructed in accordance with this invention may be secured to the jacket of an inserted cable by means of various mechanical or chemical bonding techniques which will provide a peripheral seal between the outer jacket of a cable and the outer cap of the connector.
  • FIGURE 4 represents a transverse cross section through contact element 220 of FIGURE 3.
  • This figure illustrates a feature of this invention which serves to increase the conductive surface area of the inner contact while decreasing its actual physical volume.
  • central spine 231 is seen to be provided with a plurality of longitudinally extending fluted portions 233.
  • this invention is equally applicable to forms such as splices for joining two cables of the same or even different types.
  • splices for joining two cables of the same or even different types.
  • Such joined connectors might readily be of identical configurations with the same or different dimensions.
  • the spiral ramp portion in one half of the connector is formed in a right-hand configuration while the opposite spiral ramp has a lefthand characteristic.
  • a splice connector thus formed may be simultaneously inserted in two oppositely facing cable ends in response to axial rotation of the joint connector in a given direction.
  • An electrical connector adapted to be electrically coupled to the end of an electrical cable having a homogeneous central core of highly ductile metal enclosed within a substantially tubular insulating jacket, said connector comprising:
  • an end cap member capable of telescopically receiving the end of an insulated cable
  • an inner contact member mounted substantially coaxially within said end cap member and having an outermost diameter not substantially less than the inner diameter of the cable jacket;
  • an insulation support portion on said inner contact member including a longitudinally extending section having the outermost diameter thereof substantially coincident with a theoretical cylindrical surface of given uniform diameter
  • external contact means electrically coupled to said inner contact member, including a conductive surface accessible from the exterior of said cap member;
  • said inner contact member having a shape which presents a relatively high ratio between the theoretical volume enclosed within said theoretical surface and the actual physical volume of said inner contact member.
  • corkscrew shaped inner contact member has relatively sharp outer edges adapted to engage the inner diameter wall of a cable jacket.
  • said inner contact member has the form of a helical screw, including a threaded portion of substantially uniform diameter corresponding to said insulation support portion, and a pointed end portion.
  • said helical screw contact member includes a plurality of threads having relatively sharp outer edges adapted to engage the inner diameter wall of a cable jacket.
  • An electrical connector in accordance with claim 1 further including means on said end cap capable of engaging and forming a peripheral seal with the end of an inserted cable.
  • An electrical connector in accordance with claim 1 further including means on said end cap adapted for engaging the end of an inserted cable to hold the end of such a cable at a finite axial distance from the inner end of said end cap, thereby providing an inner enclosed space extending beyond the end of such a cable.
  • An electrical connector adapted to be electrically coupled to the end of an electrical cable having a homogeneous central core of highly ductile metal enclosed within a substantially tubular insulating jacket, said connector comprising:
  • an end cap member formed of malleable conductive metal capable of telescopically receiving the end of an insulated cable of the type described;
  • an insulation support portion on said inner contact member including a longitudinally extending section having the outermost dimensions thereof substantially coincident with a theoretical cylindrical surface of uniform diameter which is not substantially less than the core diameter of an inserted cable; external contact means electrically coupled to said inner contact member, including a conductive surface portion accessible from the exterior of said cap member;
  • said inner contact member being characterized by a shape which presents a relatively high ratio between the theoretical volume enclosed within said theoretical surface and the actual physical volume of said inner contact member;
  • An electrical connection comprising:
  • an electrical cable having a substantially tubular outer jacket of flexible insulating material and a homogeneous core of highly ductile conductive material disposed within said jacket; an inner contact member embedded in said homogeneous core, said inner contact member having an outermost diameter not substantially less than the inner diameter of said tubular outer jacket;
  • an end cap member telescopically disposed about the outer periphery of said tubular insulating jacket, and having a closed end thereon; external contact means electrically coupled to said inner contact member, including a conductive surface accessible from the exterior of said cap member;
  • said inner contact member having the outermost dimensions thereof substantially coincident with a theoretical cylindrical surface of given uniform diameter, said inner contact member having a shape which presents a relatively high ratio between the theoretical volume enclosed within said theoretical surface and the actual physical volume of said inner contact member.

Landscapes

  • Cable Accessories (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
US510771A 1965-12-01 1965-12-01 Homogeneous sodium conductor connections Expired - Lifetime US3347977A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US510771A US3347977A (en) 1965-12-01 1965-12-01 Homogeneous sodium conductor connections
FR84951A FR1502297A (fr) 1965-12-01 1966-11-25 Dispositif et procédé de connexion électrique
GB52937/66A GB1147039A (en) 1965-12-01 1966-11-25 Homogeneous conductor connections
SE16235/66A SE320718B (enrdf_load_html_response) 1965-12-01 1966-11-28
ES0333878A ES333878A1 (es) 1965-12-01 1966-11-28 Perfeccionamientos introducidos en, o relacionados con, conectadores electricos.
BE690393D BE690393A (enrdf_load_html_response) 1965-12-01 1966-11-29
NL6616813A NL6616813A (enrdf_load_html_response) 1965-12-01 1966-11-29
CH1704266A CH452645A (fr) 1965-12-01 1966-11-29 Procédé de connexion électrique, connecteur pour la mise en oeuvre de ce procédé et connexion résultant du procédé
DE19661590185 DE1590185B1 (de) 1965-12-01 1966-12-01 Kabelendverschluss

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US510771A US3347977A (en) 1965-12-01 1965-12-01 Homogeneous sodium conductor connections

Publications (1)

Publication Number Publication Date
US3347977A true US3347977A (en) 1967-10-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
US510771A Expired - Lifetime US3347977A (en) 1965-12-01 1965-12-01 Homogeneous sodium conductor connections

Country Status (9)

Country Link
US (1) US3347977A (enrdf_load_html_response)
BE (1) BE690393A (enrdf_load_html_response)
CH (1) CH452645A (enrdf_load_html_response)
DE (1) DE1590185B1 (enrdf_load_html_response)
ES (1) ES333878A1 (enrdf_load_html_response)
FR (1) FR1502297A (enrdf_load_html_response)
GB (1) GB1147039A (enrdf_load_html_response)
NL (1) NL6616813A (enrdf_load_html_response)
SE (1) SE320718B (enrdf_load_html_response)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3517112A (en) * 1967-09-06 1970-06-23 Amp Inc Electrical terminal connector for sodium cable
US3673313A (en) * 1970-04-23 1972-06-27 Utility Ind Inc Electrical junction for high-current conductors and connector and method suitable for making same
US4707566A (en) * 1985-07-18 1987-11-17 Raychem Limited Electrical crimp connection
US20060000632A1 (en) * 2004-07-05 2006-01-05 Scott Thompson Flexible high temperature cables
US20140045385A1 (en) * 2012-08-08 2014-02-13 Lisa Draxlmaier Gmbh Connecting piece and method for affixing a connecting piece to one end of a cable

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2235596A (en) * 1989-08-23 1991-03-06 Itt Ind Ltd Improvements relating to electrical connectors

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659795A (en) * 1951-11-01 1953-11-17 Wiegand Co Edwin L Sheathed resistor electric heater
US3109691A (en) * 1960-04-21 1963-11-05 Hirschmann Radiotechnik Connection element for ignition cables having a tubular internal conductor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE711166C (de) * 1939-11-05 1941-09-26 Siemens Schuckertwerke Akt Ges Verfahren zur elektrisch leitenden Verbindung von Metallen mit verschiedenem Schmelzpunkt, insbesondere Aluminium und Kupfer
DE1850865U (de) * 1961-11-08 1962-05-03 Licentia Gmbh Hochspannungskabelanschluss fuer kleintransformatoren, insbesondere zuendtransformatoren.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659795A (en) * 1951-11-01 1953-11-17 Wiegand Co Edwin L Sheathed resistor electric heater
US3109691A (en) * 1960-04-21 1963-11-05 Hirschmann Radiotechnik Connection element for ignition cables having a tubular internal conductor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3517112A (en) * 1967-09-06 1970-06-23 Amp Inc Electrical terminal connector for sodium cable
US3673313A (en) * 1970-04-23 1972-06-27 Utility Ind Inc Electrical junction for high-current conductors and connector and method suitable for making same
US4707566A (en) * 1985-07-18 1987-11-17 Raychem Limited Electrical crimp connection
EP0210062A3 (en) * 1985-07-18 1988-10-26 Raychem Limited Electrical crimp connection
US20060000632A1 (en) * 2004-07-05 2006-01-05 Scott Thompson Flexible high temperature cables
US7557300B2 (en) * 2004-07-05 2009-07-07 Versa Power Systems, Ltd. Flexible high temperature cables
US20140045385A1 (en) * 2012-08-08 2014-02-13 Lisa Draxlmaier Gmbh Connecting piece and method for affixing a connecting piece to one end of a cable
US9246287B2 (en) * 2012-08-08 2016-01-26 Lisa Draexlmaier Gmbh Connecting piece and method for affixing a connecting piece to one end of a cable

Also Published As

Publication number Publication date
NL6616813A (enrdf_load_html_response) 1967-06-02
DE1590185B1 (de) 1971-01-28
GB1147039A (en) 1969-04-02
SE320718B (enrdf_load_html_response) 1970-02-16
FR1502297A (fr) 1967-11-18
ES333878A1 (es) 1967-12-16
BE690393A (enrdf_load_html_response) 1967-05-29
CH452645A (fr) 1968-03-15

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