WO2006083309A2 - Substrat metallique a revetement polymere - Google Patents

Substrat metallique a revetement polymere Download PDF

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Publication number
WO2006083309A2
WO2006083309A2 PCT/US2005/022558 US2005022558W WO2006083309A2 WO 2006083309 A2 WO2006083309 A2 WO 2006083309A2 US 2005022558 W US2005022558 W US 2005022558W WO 2006083309 A2 WO2006083309 A2 WO 2006083309A2
Authority
WO
WIPO (PCT)
Prior art keywords
polymer
substrate
steel
bullet
coating
Prior art date
Application number
PCT/US2005/022558
Other languages
English (en)
Other versions
WO2006083309A3 (fr
Inventor
Bruce Rice
Mike Hartman
Original Assignee
Thomas Steel Strip Corporations
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 Thomas Steel Strip Corporations filed Critical Thomas Steel Strip Corporations
Publication of WO2006083309A2 publication Critical patent/WO2006083309A2/fr
Priority to US11/613,744 priority Critical patent/US20070095241A1/en
Publication of WO2006083309A3 publication Critical patent/WO2006083309A3/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/06—Rod-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/02—Plate construction
    • F41H5/04—Plate construction composed of more than one layer
    • F41H5/0442—Layered armour containing metal
    • F41H5/0457—Metal layers in combination with additional layers made of fibres, fabrics or plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51—Elastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/554—Wear resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2571/00—Protective equipment
    • B32B2571/02—Protective equipment defensive, e.g. armour plates, anti-ballistic clothing

Definitions

  • the present invention relates to a coating to a metal substrate, particularly a polymer coating for a metal sheet that is used to produce a bullet jacket or ammunition cartridge. Even more particularly, the present invention relates to a polymer coating that is applied directly to a base metal in a sheet or strip form by methods that include coil-coating, reverse roll-coating, film lamination, and co-extrusion that results in performance benefits including reduced fouling in the rifling, reduced barrel wear, improved ballistics and lower costs.
  • 95/5 which is known as gilding metal
  • 90/10 which is known as commercial bronze
  • 70/30 which is known as cartridge brass, and bronze-clad steel.
  • the materials chosen today are typically used for their forming characteristics and functionality in the rifle or pistol barrel.
  • the finished bullet jacket must be ductile enough to "groove” into the rifling. This "groove” provides the bullet with the required spin in order to maintain accuracy.
  • copper/zinc alloy bullet jackets must be stress-relief annealed between two consecutive drawing (and ironing) steps, which adds time and expense to the manufacturing process.
  • a conventional bullet jacket is produced from 95/5 gilding metal or 90/10 commercial bronze by deep drawing.
  • a sheet of the metal is blanked, cupped and annealed. After annealing, the cup is then pickled in acid, washed and drawn into the final form. The jacket is then trimmed prior to being filled with lead.
  • Another technology used to produce jacketed bullets is electroplating, whereby a swagged lead bullet may be copper plated with an extremely heavy layer of copper (ie. 0.025 inches (0.635mm)). This process is slow and expensive because the electroplating of individual parts is more difficult to control.
  • a projectile having a metal or ceramic core surrounded by a plastic jacket is known in the art.
  • the jacket of the projectile is made from a flexible, resilient material such as polytetrafluoroethylene (PTFE, also known as TEFLON®) so that the jacket takes most or essentially all of the deformation of the projectile and barrel when the projectile is fired.
  • PTFE polytetrafluoroethylene
  • the jacket of the projectile thus protects the lead or ceramic core from deformation or damage and reduces wear on the barrel.
  • the ridges on the projectile formed by the rifling grooves of the barrel either reduce in size or disappear altogether.
  • the projectile consequently has a smoother, more aerodynamically efficient surface during flight and has a more accurately predictable flight path.
  • the core can be cast or swagged by a press having a relatively small capacity.
  • the core then has the plastic jacket injection molded around it, preferably using a thermosetting resin, although a castable urethane plastic can also be used.
  • the core of the projectile can be made of various weights, centers of gravity or shapes without changing the overall configuration of the projectile.
  • the thickness of the polymer coating in such a projectile requires the expensive step of individually molding or casting the polymer onto the previously- formed shells.
  • individually molded parts have a mold parting line, which is caused by the basic function of injection molding in a split cavity mold. This "parting line" is not only cosmetically unacceptable but may also serve to negatively affect the accuracy of the bullet jacket. It is more desirable to apply the polymer coating before forming the shell.
  • a polymer that could maintain its physical integrity during the drawing process for producing a bullet jacket was not previously known.
  • the present invention provides a method of producing a polymer- coated bullet jacket.
  • the method comprises applying a polymer to a substrate and drawing the substrate to form a polymer-coated bullet jacket.
  • Polymers include but are not limited to, fluoropolymers such as polymers of perfluoropropyl vinyl ether (PPVE), tetrafluoroethylene (TFE), hexafluoropropylene (HFP), vinylidene fluoride (VDF) and mixtures thereof.
  • fluoropolymers such as polymers of perfluoropropyl vinyl ether (PPVE), tetrafluoroethylene (TFE), hexafluoropropylene (HFP), vinylidene fluoride (VDF) and mixtures thereof.
  • Polymers may also include polypropylene (PP), polyethylene (PE), polyethyleneterephthalate (PET), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyvinyl-fluoride (PVF), ethylene-chlorotrifluoroethylene (ECTFE), ethylene- tetrafluoroethylene-copolymer (ETFE), fluoroethylene-propylene (FEP), perfluoralkoxy (PFA), polychloro-trifluoroethylene (PCTFE) and mixtures thereof.
  • the polymer may also be a polymer having a melting temperature greater than about 200 0 C.
  • Suitable polymers include non-fluorinated polymers such as polyesters, as exemplified by polyethylene terephthalate (PET). These polymers provide the benefit of fluorinated polymers in that they reduce barrel wear and fouling, but are not believed to impart the ability to defeat anti- ballistic body armor, as TEFLON coatings on bullet jackets do. In this way, the polyester coated substrate provides a bullet jacket that provides a more commonly acceptable ammunition round, that is, one that will not defeat body armor worn by law enforcement personnel. Polymers with an abrasion and wear resistance less than 20mg per 250 revolutions as described by the Taber Abraser Test (ASTM D4060) are also envisioned as being suitable in the present invention.
  • ASTM D4060 Taber Abraser Test
  • Surface roughness of the bullet jacket is also important and polymers with roughness values on the order of 25 microinches Ra or less as determined by Surface Roughness / Texture Test (DIN 4762 or ASME B46.1) may also be particularly suitable. It is also envisioned that the polymer may also include coloring to enhance the esthetics of the coated substrate. For example, a copper colored polymer may be used on a substrate to imitate the appearance of copper-plated substrate.
  • bullet jackets may typically be produced using copper/zinc alloys such as gilding metal or commercial bronze, or bronze-clad steel. In the present invention, these may also be used as the substrate for the polymer coating, among others.
  • copper-plated steel, or non-plated steel, such as low carbon steel may also be used.
  • Interstitial-free steel, ultra-low carbon steel, high strength low alloy steel, multiphase steel, ultra-low carbon boron steel and stainless steel are all envisioned as being acceptable.
  • a normalized or strand-annealed steel base metal are likewise envisioned as being suitable in the present invention because of the small grain size and equiaxed grain shape produced by these annealing methods. The grain size and shape are one of the keys to minimizing the exterior surface roughness of the final drawn part.
  • a suitable substrate may range in thickness from about 0.005 inch (0.127 mm) to about 0.50 inch (1.27 cm).
  • a frequently used thickness is about 0.022 inch (0.56 cm).
  • a plating layer included on a substrate may range in thickness from about 0.000020 inch (0.508 ⁇ m) to about 0.0010 inch (0.0254 mm).
  • a frequently used thickness is about 0.000050 inch (0.00127 mm).
  • the polymer may be applied by any of a variety of methods, including coil- coating, reverse roll-coating, film lamination, and extrusion.
  • Coil-coating and roll-coating are methods for applying liquified polymers and/or paints to the surface of steel in strip form.
  • the appropriate solvent is used to solubilize the polymer, which is then applied to the steel through the use of an applicator roll.
  • the wet film is then dried and cured in a oven.
  • a continuous self-supported sheet or film of the polymer is first produced in a secondary operation.
  • the self-supported film which may have a thickness ranging from about 0.0003 inch to about 0.005 inch (0.00762mm to 0.127mm), is then laminated onto the surface of the steel strip under the proper conditions of temperature and roll pressure.
  • Extrusion techniques involve applying a layer of molten polymer directly to the steel strip while using the proper conditions of temperature and rolling pressure to produce a smooth layer of the polymer on the steel strip.
  • the key is to produce a steel/polymer combination that will form the bullet jacket while remaining mutually attached and adherent.
  • the mechanical properties of each material must be well matched in terms of strength and elongation.
  • the polymer layer on the substrate may range in thickness from about 0.0003 inch (7.62 ⁇ m) to about 0.005 inch (0.127mm). It is envisioned that a thickness of about 0.001 inch (0.0254 mm) may be particularly desirable.
  • the present invention therefore also provides a bullet jacket comprising a ferrous substrate and a polymer layer bound to the substrate that is essentially devoid of a metal layer on the ferrous substrate.
  • the polymer may be a polyester or a fluropolymer, for example.
  • Suitable polymers include polytetrafluoroethylene, polyvinylidene fluoride, polyvinyl-fluoride, ethylene-chlorotrifluoroethylene copolymer, ethylene- tetrafluoroethylene-copolymer, fluoroethylene-propylene copolymer, perfluoralkoxy polymer, polychloro-trifluoroethylene, polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), and mixtures thereof.
  • a bullet jacket comprises a metal substrate, and a polyethylene terephthalate layer bound to the substrate.
  • the polymer-coated metal substrate is designed to be deep drawn into the form of a bullet jacket while maintaining its physical integrity.
  • the polymer coating does not lose its adhesion or delaminate from the metal substrate during the drawing process.
  • the ductile polymer coating can "groove" into the rifling thus providing the bullet with a spin that is required for a proper trajectory.
  • the polymer will inhibit direct contact between the metal substrate of the bullet jacket and the rifling, thus reducing or even eliminating the deposition of lead or other metals in the inner diameter of the barrel thereby reducing barrel fouling.
  • a polymer-coated metal substrate for a bullet jacket was produced by coating both sides of a ferrous-based metal substrate with a urethane-based paint that is blended with a fluoropolymer.
  • the formulation is described below: Polyeurethane 56%
  • the selected metal substrate was a 0.0245 inch (0.622 millimeter) thick sheet of copper- plated 1006 low carbon cold rolled steel.
  • the cold rolled steel was first electroplated on both sides with 0.00008 inch (0.002032 millimeter) of cyanide copper.
  • the painted coating was then applied at a thickness of 0.001 inch (0.0254 mm) using a roll-coating technique in the laboratory and thermally cured (425° F) for 30-50 seconds.
  • the polymer-coated metal substrate had the required physical integrity as evidenced by passing the Zero-T bend test.
  • the Zero-T bend test is a simple test for paint and coating adhesion whereby the coated metal sample is bent 180 degrees onto itself and then pressed flat with the use of a rubber mallet. Scotch tape is then applied to the bend radius and quickly removed. Any poorly adhering coating will adhere to the tape.
  • the clear tape is then applied to a sheet of white paper, which is used to show the presence of the loosely adhering coating.
  • a polymer-coated bullet jacket was produced using the polymer-coated metal substrate of Example 1.
  • the polymer-coated bullet jackets were stamped from 4inch x 12inch (10 cm x 30.5 cm) sheets of the polymer-coated metal substrate. The sheets were hand-fed in a transfer press.
  • a 9-mm caliber bullet jacket was then drawn and re-drawn to its final dimensions.
  • the bullet jacket was then lead-filled to complete the bullet manufacturing process.
  • the polymer-coated bullet was loaded into the chamber and tested. Several bullets were evaluated to verify the results. Ballistics firing tests revealed no metal-to-metal contact or sparking. The bullets maintained their spin and accuracy.
  • a polymer-coated metal substrate for a bullet jacket was produced by coating one side of a ferrous-based metal substrate with a 0.0008inch (0.02 mm) thick film of a polyethylene terephthalate (PET).
  • the selected metal substrate was a 0.0245 inch (0.622 millimeter) thick sheet of copper-plated 1006 low carbon cold rolled steel.
  • the cold rolled steel was first electroplated on both sides with 0.00008 inch (0.002032 millimeter) of cyanide copper.
  • the polymer film was applied by a lamination process whereby the substrate is first cleaned and degreased using a warm solution of sodium hydroxide. The substrate is then rinsed and dried prior to being heated to a temperature of 150° F. Once at temperature, the PET film is applied with the use of a roller-laminator.
  • the polymer-coated metal substrate had the required physical integrity as evidenced by passing the Zero-T bend test.
  • a polymer-coated bullet jacket was produced using the polymer-coated metal substrate of Example 3.
  • the polymer-coated bullet jackets were stamped from 4inch x 12 inch (10 cm x 30.5 cm) sheets of the polymer-coated metal substrate. The sheets were hand-fed in a transfer press.
  • a 9-mm caliber bullet jacket was then drawn and re-drawn to its final dimensions.
  • the bullet jacket was then lead-filled to complete the bullet manufacturing process.
  • the polymer coated bullet was loaded into the chamber and tested. The bullets were evaluated to verify the results. Ballistics firing tests revealed no metal-to-metal contact or sparking. The bullets maintained their spin and accuracy.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un procédé de production d'un blindage de balle à revêtement polymère consistant : à appliquer un polymère sur un substrat et à emboutir celui-ci. Le revêtement confère une épaisseur, une ductilité et une durabilité suffisantes pour remplacer la couche de gainage en cuivre/zinc classique mais également une flexibilité et une adhésion appropriée au substrat, de manière à pouvoir former celui-ci en blindage de balle après l'application du revêtement polymère. Un blindage de balle comprend un substrat ferreux ou en aluminium et une couche polymère liée au substrat et est sensiblement dépourvu d'une couche métallique sur le substrat ferreux. Un blindage de balle peut également comprendre un substrat métallique et une couche de téréphtalate de polyéthylène liée au substrat. Une bande d'acier revêtue comprend un substrat métallique et une couche polymère liée au substrat, la couche polymère comprenant une résistance à l'abrasion de Taber inférieure à une usure de 20 mg chaque 250 révolutions.
PCT/US2005/022558 2004-06-25 2005-06-24 Substrat metallique a revetement polymere WO2006083309A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/613,744 US20070095241A1 (en) 2005-06-24 2006-12-20 Polymer-coated metal substrate

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US58287604P 2004-06-25 2004-06-25
US60/582,876 2004-06-25

Publications (2)

Publication Number Publication Date
WO2006083309A2 true WO2006083309A2 (fr) 2006-08-10
WO2006083309A3 WO2006083309A3 (fr) 2007-07-12

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PCT/US2005/022558 WO2006083309A2 (fr) 2004-06-25 2005-06-24 Substrat metallique a revetement polymere

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2592403A (en) * 2020-02-27 2021-09-01 Bae Systems Plc Improvements relating to ammunition
IL295723B1 (en) * 2020-02-27 2023-12-01 Bae Systems Plc Ammunition related improvements

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8689671B2 (en) 2006-09-29 2014-04-08 Federal-Mogul World Wide, Inc. Lightweight armor and methods of making

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748701A (en) * 1951-08-28 1956-06-05 Wendell P Barrows Electrically conductive coating
US3749021A (en) * 1970-12-18 1973-07-31 Gulf & Western Ind Prod Co Metal coated plastic cartridge case and method of manufacture

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748701A (en) * 1951-08-28 1956-06-05 Wendell P Barrows Electrically conductive coating
US3749021A (en) * 1970-12-18 1973-07-31 Gulf & Western Ind Prod Co Metal coated plastic cartridge case and method of manufacture

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2592403A (en) * 2020-02-27 2021-09-01 Bae Systems Plc Improvements relating to ammunition
GB2592403B (en) * 2020-02-27 2022-09-28 Bae Systems Plc Improvements relating to ammunition
IL295723B1 (en) * 2020-02-27 2023-12-01 Bae Systems Plc Ammunition related improvements
US11867489B2 (en) 2020-02-27 2024-01-09 Bae Systems Plc Relating to ammunition
IL295723B2 (en) * 2020-02-27 2024-04-01 Bae Systems Plc Ammunition related improvements

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