US3238318A - Contact bridges for radial contacts with fulcrum and resilient spring structure - Google Patents

Contact bridges for radial contacts with fulcrum and resilient spring structure Download PDF

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Publication number
US3238318A
US3238318A US356896A US35689664A US3238318A US 3238318 A US3238318 A US 3238318A US 356896 A US356896 A US 356896A US 35689664 A US35689664 A US 35689664A US 3238318 A US3238318 A US 3238318A
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United States
Prior art keywords
contacts
contact bridge
contact
pair
pairs
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Expired - Lifetime
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US356896A
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English (en)
Inventor
Bleibtreu Alexander
Baumgartner Ernst
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Scheubeck GmbH and Co
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Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0016—Contact arrangements for tap changers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts

Definitions

  • Transfer switches are preferably adapted to form pairs of series breaks.
  • Transfer switches for tap-changing regulating transformers which are adapted to form series breaks include two pairs of cooperating separable contacts which are serially arranged in an electric circuit. Each of the two pairs of contacts includes a fixed contact and a cooperating movable contact which is separable from the fixed contact.
  • Another object of this invention is to provide transfer switches for tap-changing regulating transformers adapted to equalize the degree of erosion due to arcing occurring at two serially related points of break.
  • Pairs of movable contacts of transfer switches for tapchanging regulating transformers are often supported by a common contact support, or contact bridge, which is, in turn, supported by a contact bridge support, resilient means such as springs being interposed between the contact bridge and the contact bridge support.
  • a common contact support or contact bridge
  • resilient means such as springs being interposed between the contact bridge and the contact bridge support.
  • the present invention is predicated upon a departure from the principle of synchronization of contact separation and arc initiation. Structures embodying this invention are predicated on a novel sequence of steps.
  • the pair of serially related contacts which is subject to a relatively small degree of erosion is caused to part first, and the pair of serially related contacts which is subject to a relatively larger degree of erosion is caused to part last.
  • the degree of erosion of both serially related pairs of contacts is maintained reasonably, or substantially, equal.
  • FIG. 1 is a vertical section of a contact structure embodying this invention taken along 1-1 of FIG. 2, this contact structure being intended to form a part of a transfer switch for a tap-changing regulating transformer.
  • FIG. 2 is in part a section taken along 22 of FIG. 1 and in part a top plan view of a transfer switch for a tap changing regulating transformer including the contact structure of FIG. 1, FIG. 2 being drawn on a smaller scale than FIG. 1; and
  • FIGS. 3-7 are semi-diagrammatic illustrations of the contact structure of FIG. 1 in various operating position thereof.
  • FIGS. 1 and 2 reference character 1 has been applied to indicate a cylindrical tank of insulating materials which may be oil filled.
  • the upper portion of tank 1 accommodates a cylindrical transfer switch housing 2 of insulating material arranged in coaxial relation to tank 1.
  • the lower portion of tank 1 may be used to accommodate switch-over resistors forming part of the transfer switch of FIG. 2. These resistors are not shown in FIG. 2.
  • FIG. 2 For details relating to the arrangement of these resistors in tank 1 as well as for details relating to the structure of FIG. 2, but not immediately relevant to the present invention, reference may be had to the copending patent application of Alexander Bleibtreu, Serial No. 255,291; filed January 31, 1963, now Patent No. 3,174,097, for Transfer Switch for Tap Changers for Regulating I Transformers. Terminals 3 integral with tank 1 are intended to connect the transfer switch of FIG. 2 to the neutral point of a regulating transformer.
  • FIG. 2 further comprises three vertical bars 5 rectangular in cross-section of which the upper ends and the lower ends are attached to spaced horizontal guide plates 6.
  • FIG. 2 has been drawn assuming the upper guide plate to be removed and thus exposing to view the axially inner surface of the lower guide plate 6.
  • Both guide plates are provided with a central aperture or bore 6b.
  • the aperture or bore 6b exposes to View portions of the structure situated at a bore 6b.
  • the aperture or bore 612 exposes to view portions of the structure situated at a lower level than lower guide plate 6.
  • Both guide plates 6 define radial contact guiding grooves 6a at the juxtaposed surfaces or sides thereof.
  • Pivotable shaft 7 extends along the common axis of tank 1 and of switch housing 2 and operates a pair of spaced horizontal end plates 8 of which but one is shown in FIG. 2, i.e., the end plate 8 arranged below the lower guide plate 6.
  • the shaft is made up of a central portion including three arms enclosing angles of deg. and cylindrical end portions intended to be received by bearings (not shown).
  • Each end plate 8 is provided with bearing means 8a for three vertical operating rods or shafts 9 angularly displaced 120.
  • Each of the three operating rods or shafts 9 is intended to operate a set of six movable contacts pertaining to one phase of a threephase transfer switch.
  • each vertical rod or shaft 9 pivotally support-s the axially inner ends of a plurality of contact operating arms 10.
  • the axially outer ends of each contact operating arm 10 form a bearing 10a for a pivot pin 11.
  • pivot pins 11 are in the form of short lengths of tubing.
  • Reference numeral 12a has been applied to indicate a radially inner contact bridge support member and reference numeral 1212 has been applied to indicate a radially outer contact bridge support member.
  • the radially inner contact bridge support member 12a is provided with three bearings 13 supported by pivot pin 11.
  • the radially outer contact bridge support member 12b is supported by the radially inner contact bridge support member 12a, and both support members 12a, 12b are electrically insulated from each other by a barrier 14 of insulating material conforming to the shapes of support members 12a, 12b.
  • Cylindrical spacers 15 space the central bearing 13 of each support member 12a from the adjacent bearings 16a of operating arms 10.
  • Each radially outer support member 12b is provided with a pair of transverse passageways 16 each accommodating a helical spring 17 and a steel ball 18 resting against insulating barrier 14.
  • the upper and lower surfaces 19 of the radially inner support members 12b are shaped to fit into contact guiding grooves 6a in guide plates 6.
  • FIG. 1 and 2 further comprises a plurality of contact bridges or contact carriers 20 each supported on support member 12a by a horizontal pivot pin 21.
  • Each contact bridge or contact carrier 20 supports movable contacts 22 on the upper end and on the lower end thereof.
  • Movable contacts 22 are in engagement with fixed contacts 23 supported by the cylindrical housing 2 of the transfer switch.
  • FIG. 1 shows contacts 22 and 23 in the engaged or closed positions thereof, thus establishing the following current path: lower terminal 24, lower fixed contact 23, lower movable contact 22, contact bridge 20, upper movable contact 22, upper fixed contact 23, upper terminal 24.
  • the radially outer contact bridge support member 12a is provided with a central projection receiving pivot pin 21 which is a fulcrum for pivotal motions of contact bridge 21 and the movable contacts 22 which are supported by support member 12a.
  • each pair of aligned fixed contacts 22 is arranged inside of a channel-shaped insulating barrier 27 and thus insulated from the immediately adjacent pair of fixed contacts 23 which is at a somewhat different potential.
  • Each pair of fixed contacts 23 is arranged along a vertical line. The vertical lines along which pairs of fixed contacts 23 are arranged are angularly displaced generatrices of cylindrical housing 2.
  • the transfer switch of FIGS. 1 and 2 comprises six pairs of fixed arcing contacts 23 and six pairs of cooperating movable arcing contacts 22 per phase of a threephase circuit.
  • the number of pairs of fixed arcing contacts 23, of movable arcing contacts 22, and consequently that of contact bridges 20 and that of contact bridge supports 12a, 12b may be changed to conform with specific requirements.
  • the structure of FIGS. 1 and 2 may be provided with fixed and movable main current carrying contacts in addition to cooperating arcing contacts 22, 23.
  • the provision of main current carrying contacts is optional and has been shown in detail in the aforementioned patent application Serial No. 255,291.
  • Both fixed contacts 23 and both movable contacts 22 associated with one of bridges 20 and one of supports 12a, 12b are identical. As long as upper arcing contacts 22, 23 and lower arcing contacts 22, 23 are not eroded by arcing, contact bridge 20 supporting contact 22 remains in its vertical position, i.e., it will not pivot about fulcrum pin 21 whether both contacts 22 are in engagement or out of engagement with both contacts 23. Such a pivotal motion may and will take place when the erosion due to arcing of an upper pair of cooperating arcing contacts 22, 23 and of a lower pair of cooperating arcing contacts 22, 23 is unequal, and such pivotal motion tends to equalize the contact erosion at the upper and lower pair of arcing contacts. How this is being achieved will now be set forth in detail in connection with FIGS. 3-7 which show, in a simplified fashion, substantially the same structure as FIG. 1 in different operating position thereof.
  • FIGS. 3-7 the same reference characters with a prime added have been applied to indicate like parts as in FIG. 1.
  • reference character 2' has been applied to indicate a common support of insulating material for a pair of identical fixed arcing contacts 23 whose centers are arranged along a vertical straight line parallef to the surface of insulating support 2'.
  • a pair of movable contacts 22' supported by contact bridge 20' are adapted to engage, and to be separated from, fixed contacts 23.
  • Contact bridge 20' has a projection 28' on the side thereof remote from fixed arcing contacts 23'.
  • a single contact bridge support 12 takes the place of the two bridge support members 12a, 12b in the structure of FIG. 1.
  • Bridge support 12' has a central projection 29 and projections 26' at the ends thereof.
  • a horizontal pivot pin 21 extends transversely through projection 28 of contact bridge 20 and projection 29' of bridge support 12'.
  • Projections 26' of bridge support 12 define a pair of knife-edge bearings each receiving one edge or end of a sinusoidally shaped compression leaf spring 25'.
  • Projection 28' of contact bridge 20 defines a pair of knife-edge bearings juxtaposed to the knife-edge bearings defined by projections 26'.
  • Each knife-edge bearings defined by projection 28 of contact bridge 20' are engaged by one end or edge of sinusoidally shaped compression leaf springs 25'.
  • the straight line which may be drawn through the centers of contacts 22' is a vertical line extending parallel to the surface of contact support 2' and parallel to the line which may be drawn through the centers of fixed contacts 23'. This is true whether the pair of contacts 22', 22' is in engagement with the pair of contacts 23', 23' or not.
  • contact erosion prevail the direction of the equal and opposed forces exerted by springs 25' upon contact bridge 20' extends transversely across pin or fulcrum 21. Therefore contact bridge 20 and movable contacts 22' are not subject to any torque tending to pivot these parts about pin 21'.
  • FIG. 3 refers to such a condition.
  • FIG. 4 shows the same structure as FIG. 3, but in drawing FIG. 4 it was assumed that the upper cooperating contacts 22', 23 had undergone a higher degree of erosion than the lower cooperating contacts 22, 23.
  • engagement of the lower arcing contacts 22., 23' caused a counterclockwise pivotal motion of contact bridge 20' and of contacts 22 about pin or fulcrum 21'.
  • springs 25' impart a torque to contact bridge 20' tending to cause a counterclockwise pivotal motion thereof about horizontal pin or fulcrum 21'.
  • contact bridge 20 is not free to pivot about pin 21' beyond the position shown in FIG. 4.
  • contact bridge support 12 is moved from left to right, or in other words, from the position shown in FIG. 4 to the position shown in FIG. 5.
  • This makes it possible for contact bridge 20 to turn about pivot 21 in counterclockwise direction by virtue of the torque resulting from the presence of the two bridgebiasing leaf spring 25'. Therefore parting of the lower or less eroded arcing contacts 22', 23' precedes parting of the upper or more eroded arcing contacts 22, 23'.
  • Projections 26 of contact bridge support 12' form abutments limiting the pivotal motion of bridge 20' about horizontal pin 21' in clockwise direction as well as in counterclockwise direction.
  • FIG. 6 refers to the same structure as FIG. 3 and has been drawn under the assumption that the degree of erosion of the lower cooperating pair of arcing contacts 22', 23' exceeds the erosion of the upper pair of cooperating arcing contacts 22', 23. Therefore contact bridge 20' is tilted in clockwise direction upon engagement of the upper and the lower cooperating pair of arcing contacts 22', 23'. As a result, over-center springs 25 subject contact bridge 20' to a torque in clockwise direction. As long as both pairs of contacts 22, 23' are in engagement and bridge support 12' is in the position shown in FIG. 6, bridge 20 cannot pivot clockwise beyond the position thereof shown in FIG. 6. However, when contact bridge support 12 is moved from the position shown in FIG. 6 to the right-as shown in FIG.
  • FIG. 7 shows the contact structure in a position subsequent to parting of the upper pair of arcing contacts 22, 23', but prior to parting of the lower arcing contacts 22, 23'. Parting of the lower arcing contacts 22, 23 showing a greater degree of erosion, or wear, occurs upon continued horizontal movement of contact support 12 in the direction from left to right.
  • the pair of arcing contacts 22, 23' showing a lesser degree of erosion, or wear, parts first be it the upper pair of arcing contacts or the lower pair of arcing contacts. Since arcing is initiated at the pair of contacts which parts first, the arcing time and the amount of contact erosion at the pair of contacts which parts first exceed the arcing time and the amount of contact erosion at the other pair of contacts. This tends, in the long run, to equalize the amount of erosion, or wear, on the upper and on the lower pair of arcing contacts 22', 23'.
  • the pair of arcing contacts 22, 23' which separates last at an opening operation engages first at a closing operation.
  • the pair of contacts which opens first is the pair of contacts to close last.
  • FIGS. 37 the directions in which over-center biasing springs 25 act upon projection 28' of contact bridge 20 have been indicated by dash-and-dot lines to which reference character F has been applied.
  • lines F makes it more convenient to ascertain the direction of the torque or couples to which contact bridges 20' and movable contacts 22' are subjected.
  • FIGS. 3-7 illustrate movable and fixed contacts whose contact surfaces are round or spherical
  • the invention is not limited to contacts having such a geometry. This is readily apparent from a consideration of the structures of FIGS. 1 and 2 having arcing contacts 22, 23 substantially in the shape of prisms having flat abutting contact surfaces.
  • contact bridge 20' will be spring biased in clockwise direction, and then its spring bias will tend to be counterclockwise, etc.
  • the continuous or frequent change in the direction of the spring bias of contact bridge 20' depends upon the respective degree of erosion of the upper pair and of the lower pair of arcing contacts 22', 23.
  • reference character h has been applied to indicate the height of the upper fixed contact 23 and reference character h has been applied to indicate the height of the upper movable contact 22' engaging the first mentioned contact and separable from the first mentioned contact.
  • reference character I1 has been applied to indicate the height of the lower fixed contact 23 and reference character ki has been applied to indicate the height of the lower movable contact 22' engaging the first-mentioned contact and separable from the first-mentioned contact.
  • FIGS. 6 and 7 which show contact bridge 20 as being biased in clockwise direction by springs 25.
  • center of contacts 22., 23' as used in this context is the center of mass within the meaning in which this term is being used in kinematics.
  • An electric switching device comprising in combination:
  • a contact bridge support having fulcrum means pivotally supporting said contact bridge, said fulcrum means being spaced from said straight line and having a geometrical axis at right angles to said straight line;
  • An electric switching device comprising in combination:
  • An electric switching device comprising in combination:
  • said two pairs of contacts including two fixed substantially identical contacts having a predetermined height and being arranged in spaced relation along a straight line, and said two pairs of contacts further including two movable substantially identical contacts having a predetermined height;
  • a contact bridge support having fulcrum means pivotally supporting said contact bridge, said fulcrum means being spaced from said straight line and having a geometrical axis at right angles to said straight line;
  • spring means interposed between said contact bridge and said contact bridge support, said spring means being arranged to exert a force upon said contact bridge directed transversely across said geometrical axis of said fulcrum means when said two pairs of contacts are in said engaged positions thereof and the aggregate height of each of said two pairs of contacts is substantially equal and to subject said contact bridge to a torque when said two pairs of contacts are in said engaged positions thereof and the aggregate height of each of said two pairs of contacts is unequal.
  • An electric switching device comprising in combination:
  • a contact bridge support having fulcrum means pivotally supporting said contact bridge, said fulcrum means being spaced from said straight line and having a geometrical axis at right angles to said straight line;
  • An electric switching device comprising in combination:
  • a movable contact bridge support having fulcrum means pivotally supporting said contact bridge, said contact bridge support further including a pair of knife-edge bearings each juxtaposed to one of said pair of knife-edge bearings on said contact bridge;
  • An electric switching device comprising in combination:
  • An electric switching device comprising in combination:
  • An electric switching device comprising in combination:
  • a contact bridge support providing at the center thereof a pivotal support for said contact bridge and having at the ends thereof a pair of abutment members limiting the pivotal motion of said contact bridge relative to said contact bridge support, each of said pair of abutment members defining one of a pair of knife-edge bearings;
  • each of said pair of springs resting with one end thereof in one of said pair of knife-edge bearings defined by said contact bridge and each of said pair of springs resting with the other end thereof in one of said pair of knife-edge bearings defined by one of said pair of abutment members.
  • An electric switching device comprising in combination:
  • An electric switching device comprising in combination:
  • An electric switching device comprising in combination:
  • torque imparting means responsive to the difference between the degree of erosion of said first fixed contact and said first movable contact and the degree of erosion of said second fixed contact and said second movable contact to selectively tilt said contact bridge about said fulcrum means in either of two different directions upon joint movement of said contact bridge support and of said contact bridge relative to said first and second fixed contacts.
  • An electric switching device comprising in combination:
  • An electric switching device comprising in coinbination:
  • a contact bridge support including a first portion having pivot means spaced from and extending at right angles to said generatrix and pivotally supporting said contact bridge adjacent the center thereof, a second portion supporting said first portion, and electric insulating means interposed between said first portion and said second portion;
  • spring means biasing said first portion away from said second portion to cause resilient engagement of said two pairs of cooperting contacts
  • An electric switching device comprising in combination:
  • a contact bridge support including a radially outer portion having pivot means extending at right angles to said generatrix and pivotally supporting said con tact bridge adjacent the center thereof, a radially inner portion supporting said radially outer portion, and electric insulating means interposed between said radially outer portion and said radially inner portion;
  • a transfer switch for tap-changing regulating transformers comprising in combination:
  • each of said plurality of contact bridges having a pair of spring bearings each being pivotally supported adjacent the center thereof and each having a vertical position'and slanting positions;
  • each of said plurality of contact bridge supports including a first portion having a horizontal pivot means for pivotally supporting one of said plurality of contact bridges and having a pair of spring bearings, a second portion supporting said first portion, and insulating means electrically insulating said first portion from said second portion;
  • each pair of said plurality of pairs of springs having ends resting in said pair of spring bearings of one of said plurality of contact bridges and each pair of said plurality of pairs of springs having ends resting in one of said pair of spring bearings of said first portion of each of said plurality of contact bridge supports, each pair of said plurality of pairs of springs being arranged to exert upon one of said plurality of contact bridges opposite forces extending transversely through said pivot means of one of said plurality of contact bridge supports when said one of said plurality of contact bridges is in said vertical position thereof and subjecting said one of Said plurality of contact bridges to a torque when said one of said plurality of contact bridges is in one of said slanting postions thereof; and
  • each of said pairs of abutment means being integral with one of said plurality of contact bridge supports for limiting the pivotal motion of each of said plurality of contact bridges relative to one of said plurality of contact bridge supports.
  • a transfer switch for tap-changing regulating transformers comprising in combination:
  • each of said plurality of contact bridges defining a pair of knife-edge bearings, each being pivotally supported adjacent the center thereof and each having a vertical position and slanting positions;
  • a plurality of contact bridge supports each including a radially outer portion having horizontal pivot means supporting one of said plurality of contact bridges and defining a pair of knife-edge bearings, a radially inner portion supporting said radially outer portion, and insulating means electrically insulating said radially outer portion from said radially inner portion;
  • each pair of said plurality of pairs of springs having ends resting in said pair of knife-edge bearings defined by one of said plurality of contact bridges and each pair of said plurality of pairs of springs having ends resting in said pair of knife-edge bearings defined by said radially outer portion of one of said plurality of contact bridge supports, each pair of said plurality of pairs of springs being arranged to exert opposing vertical forces extending transversely through said horizontal pivot means for one of said plurality of contact bridges as long as said one of said plurality of contact bridges is substantially in said vertical position thereof; and
  • a plurality of pairs of abutment means each integral with one of said plurality of contact bridge supports for limiting pivotal motions of each of said plurality of contact bridges relative to one of said plurality of contact bridge supports.

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  • Contacts (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US356896A 1963-05-17 1964-04-02 Contact bridges for radial contacts with fulcrum and resilient spring structure Expired - Lifetime US3238318A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM56864A DE1175336B (de) 1963-05-17 1963-05-17 Kontaktbruecke fuer elektrische Schalter mit zweifach in Serie unterbrechenden Kontaktanordnungen

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US3238318A true US3238318A (en) 1966-03-01

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US356896A Expired - Lifetime US3238318A (en) 1963-05-17 1964-04-02 Contact bridges for radial contacts with fulcrum and resilient spring structure

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US (1) US3238318A (en, 2012)
AT (1) AT243356B (en, 2012)
BE (1) BE647994A (en, 2012)
CH (1) CH412059A (en, 2012)
DE (1) DE1175336B (en, 2012)
GB (1) GB1020179A (en, 2012)
NL (2) NL6405391A (en, 2012)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3315043A (en) * 1965-07-13 1967-04-18 Reinhausen Maschf Scheubeck Transfer switch for tap changing regulating transformers including a contact support for the fixed contacts having no creepage path
US3458670A (en) * 1966-07-27 1969-07-29 Reinhausen Maschf Scheubeck Top changer contact bridge with spring-biased lost motion pin connection
US3472975A (en) * 1967-05-29 1969-10-14 Indak Mfg Corp Electrical switches with plural breaks
US3671687A (en) * 1969-12-16 1972-06-20 Reinhausen Maschf Scheubeck Transfer switch for tap-changing regulating transformers including lost motion interconnection driving mechanism
US3833780A (en) * 1972-03-16 1974-09-03 Yorkshire Switchgear & Eng Co Draw out type electrical switchgear with improved movable contact assembly mounting means
ITMI20131109A1 (it) * 2013-07-02 2015-01-03 Astra S R L Ponte asportabile per un contatto elettrico di sicurezza

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10312176B3 (de) 2003-03-19 2004-06-09 Maschinenfabrik Reinhausen Gmbh Lastumschalter für einen Stufenschalter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3315043A (en) * 1965-07-13 1967-04-18 Reinhausen Maschf Scheubeck Transfer switch for tap changing regulating transformers including a contact support for the fixed contacts having no creepage path
US3458670A (en) * 1966-07-27 1969-07-29 Reinhausen Maschf Scheubeck Top changer contact bridge with spring-biased lost motion pin connection
US3472975A (en) * 1967-05-29 1969-10-14 Indak Mfg Corp Electrical switches with plural breaks
US3671687A (en) * 1969-12-16 1972-06-20 Reinhausen Maschf Scheubeck Transfer switch for tap-changing regulating transformers including lost motion interconnection driving mechanism
US3833780A (en) * 1972-03-16 1974-09-03 Yorkshire Switchgear & Eng Co Draw out type electrical switchgear with improved movable contact assembly mounting means
ITMI20131109A1 (it) * 2013-07-02 2015-01-03 Astra S R L Ponte asportabile per un contatto elettrico di sicurezza

Also Published As

Publication number Publication date
AT243356B (de) 1965-11-10
GB1020179A (en) 1966-02-16
DE1175336B (de) 1964-08-06
CH412059A (de) 1966-04-30
NL120901C (en, 2012)
NL6405391A (en, 2012) 1964-11-18
BE647994A (en, 2012) 1964-08-31

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