US3793648A - Bullet-resisting armor - Google Patents

Bullet-resisting armor Download PDF

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Publication number
US3793648A
US3793648A US00315422A US3793648DA US3793648A US 3793648 A US3793648 A US 3793648A US 00315422 A US00315422 A US 00315422A US 3793648D A US3793648D A US 3793648DA US 3793648 A US3793648 A US 3793648A
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United States
Prior art keywords
layer
set forth
plate member
garment
backing
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
US00315422A
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English (en)
Inventor
E Dorre
M Nussbaum
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.)
Feldmuehle Anlagen und Produktion GmbH
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Feldmuehle Anlagen und Produktion GmbH
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    • 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
    • F41H5/0414—Layered armour containing ceramic material
    • F41H5/0421—Ceramic layers in combination with metal layers
    • 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
    • F41H5/0492—Layered armour containing hard elements, e.g. plates, spheres, rods, separated from each other, the elements being connected to a further flexible layer or being embedded in a plastics or an elastomer matrix

Definitions

  • Armored vests in common use heretofore include a flexible base of sheet material, such as woven fabric, and are provided with multiple pockets and like receptacles each of which contains a plate of high-strength steel. Because of the weight of the metal, the steel plates more recently have been replaced in some instances by glass-fiber reinforced plastic. However, neither the plastic plates nor steel plates of tolerable weight can stop a high-velocity projectile, such as that of a large-caliber pistol, at reasonably close range. The reinforced plastic plates are pierced by the projectile without sufficiently reducing its kinetic energy, and the steel plates, even if they can slow or stop the projectile, are deformed or disrupted sufficiently so as themselves to injure the bearer of the protective garment.
  • a bullet or other projectile hitting the facing layer causes the same to crack, and the kinetic energy of the projectile is consumed to a large extent in overcoming the forces of cohesion which bond the crystals of the facing layer to each other.
  • a shock wave travels in the crystalline material transversely to the direction of impact at the speed of sound in the material while the crack formed by the initial impact is propagated at a much slower rate. The advancing shock wave thus proceeds in a still continuous, coherent portion of the layer, and its energy is dissipated relatively rapidly.
  • the metallic backing layer may be deformed at the point of impact to form a bulge not of sufficient magnitude in most instances to cause injury to the wearer of the vest. Even a thin layer of rubber or other elastomeric material interposed between the facing and backing layers has been found to distribute the stresses more widely on the metallic backing layer so as materially to reduce the height of the bulge formed upon impact of a projectile under otherwise identical conditions.
  • the laminar plates of the invention when replacing steel inserts, permit the protection afforded by a conventional armored vest to be increased greatly at equal weight, or the weight to be reduced sharply at equal protection. They are employed to advantage wherever else strong armor of light weight is of importance as in the seat armor of military and police helicopters.
  • FIG. 1 shows a laminar plate of the invention in fragmentary cross section on a greatly enlarged scale
  • FIG. 2 shows a first armor plate of the invention in elevational section
  • Flg. 3 illustrates another armor plate in a view corresponding to that of FIG. 2;
  • FIG. 4 is a plan view of yet another armor plate.
  • FIG. 5 is a perspective view of an armored vest equipped with armor plates of the type illustrated in FIGS. 1 to 4.
  • a laminar plate having a coherent outer layer 1 of polycrystalline, sintered aluminum oxide fired to a pore volume of less than 2 percent.
  • a rubber layer 2 separates the ceramic outer layer from a sheet 3 of high-strength aluminum alloy containing zinc and magnesium as the principal alloying elements, such as Type AA 7075, but other strong aluminum alloys may be employed to advantage.
  • the thickness of the three layers may be chosen according to the type of projectile against which protection is being sought and to the range from which the projectile is expected to be fired.
  • the ceramic layer may typically have a thickness of 1.5 to 2.5 mm
  • the rubber layer need not be thicker than 1 mm
  • the aluminum alloy backing may be 3 to 4 mm thick. It is as effective as a layer of highstrength steel having half its thickness, and therefore approximately 50 percent greater weight, and the combined layers 1, 2, 3 provide protection equal to that of a steel plate several times their combined weight.
  • Adhesives of many known types may be employed, but we are not aware of a commercially available adhesive whose bond strength is sufficient to offer measureable resistance to the stresses generated in the plate by a high-speed projectile. It is also possible to coat the ceramic and metal layers 1, 3 with known materials which permit the rubber layer 2 to be vulcanized to both other layers. The improvement, if any, achieved thereby is not commen surate with the increased cost.
  • the laminar plate illustrated in FIG. 2 includes a square, backing sheet 4 of high-strength steel having an integral raised rim 5 which extends about the entire circumference of the sheet 4 and conformingly envelops the edges of a thin sheet element 6 of sintered aluminum oxide of the type described with reference to FIG. 1.
  • the outer face of the plate 6 is flush with the raised rim 5, and a sheet-steel cover 7, too thin to offer relevant resistance to a bullet, is fastened to the steel rim 5 by soldering or spot-welding in a manner conventional in itself and not shown.
  • the ceramic element 6 is preferably inserted into the shallow trough formed by the sheet 4 and its rim 5 at elevated temperature, and it is dimensioned to provide a close fit at that temperature.
  • the greater thermal contraction of the metal as compared to that of the ceramic material causes the edges of the latter to be confined by the rim 5 under compressive stress. This has been found to impede crack propagation in the brittle ceramic layer. Under conditions in which an unconfined aluminum oxide sheet is completely shattered by a projectile, the same sheet may remain intact over a sufficient portion of its surface area to stop a second projectile hitting at some distance from the point of impact of the first projectile.
  • the cover plate is made unnecessary in the laminar assembly shown in FIG. 3 which has been found particularly useful with a metallic backing layer of aluminum alloy softer than the high-strength steel mentioned with reference to FIG. 2.
  • the laminar plate of FIG. 3 was prepared by first shaping an aluminum alloy blank under pressure into a square trough having a bottom wall 8 and a side wall 9, inserting a ceramic element 10 into the trough, and thereafter bending the free edge I] of the side wall at right angles inward of the trough to form a flange which retains the ceramic element I0.
  • Aluminum oxide elements prepared by sintering green blanks of compacted very fine powder provide a convenient combination of low cost, high strength and hardness, and relatively light weight.
  • other crystalline, non-metallic materials having a hardness value of at least 8 on the Mohs scale may be substituted for the alumina where their specific properties are of advantage, or where they may be more readily available.
  • Chromium sesquioxide forms even harder, sintered plates than alumina.
  • Other eminently suitable materials include the carbides of titanium, silicon, and boron.
  • Zirconium oxide and tungsten carbide plates are readily sintered to the high density of not more than l0 percent, and preferably less than 2 percent pore volume, required to achieve the necessary hardness and cohesion, but are too heavy for many applications.
  • Sap phire plates of the necessary thickness and having a width and length of approximately 2 inches each, as is convenient in armored vests, are available and excellently suited for the purpose of the invention, but economically unattractive at this time.
  • the integral aluminum alloy structure seen in FIG. 4 includes an obscured bottom wall, a side wall of which only flanges l2, analogous to the flanges 11 in FIG. 3, are seen, and two ribs 13 projecting upward from the bottom wall.
  • the ribs divide the initially formed aluminum alloy trough into four equal compartments respectively receiving ceramic sheet elements 14 under compressive stress as explained with reference to FIG. 2. After insertion of the ceramic plates 14, the flanges 12 were formed and the tops of the ribs 13 were simultaneously upset in an analogous manner.
  • Each of the ceramic sheet elements 14 conceals a conextensive sheet of rubber which separate the adja cent surfaces of the ceramic sheet element 14 and of the non-illustrated bottom wall in a manner evident from FIG. 1. If a composite armor plate of the invention as shown in FIG. 3 and having overall dimensions of approximately 50 mm X 50 mm X 7 mm is hit by a bullet at some distance from the center of one of the ceramic sheet elements 14, only a portion of that element may disintegrate, leaving the remainder of that element and the other three elements available for protecting the wearer of a vest armored by means of such composite armor plate. A central hit may shatter an entire ceramic element, but leave the other three intact. Under the same conditions, damage to one or more of the other ceramic elements is unavoidable in the absence of the rubber layer.
  • the number of individual ceramic sheet elements in a composite armor plate of the invention may be chosen to suit specific circumstances.
  • the singleelement plates of FIGS. 2 and 3 are usually sufficient in armored vests, but composite plates of the same overall dimensions having two or more ceramic sheet elements spacedly juxtaposed in a common plane in a manner evident from FIG. 4 offer greater protection against multiple shots from automatic weapons.
  • Composite armor plates employed under the seat and back cushions and along the sides of a helicopter pilot's seat may contain a multiplicity of individual ceramic sheet elements.
  • the metal and ceramic components employed in a helicopter seat should generally be thicker than has been described above with reference to laminar plates for an armored vest.
  • FIG. 5 Such a vest is shown in FIG. 5. It has an outer layer 15 of flexible cloth which forms the base structure of the vest. Its inner lining 16 carries rows of flat pockets 17 each of which overlaps the edges of all contiguously adjacent pockets. Each pocket serves as receptacle for a laminar plate 18 identical with any one of the devices shown in FIGS. 2 to 4, the overlap being sufficient that the edge portion of each ceramic layer in each plate 18 is aligned with the edge portion of the adjacent ceramic layer in a direction perpendicular to the outer face of the laminar structure on the ceramic layer, all ceramic layers facing in a common direction outward of the vest and away from the wearer and the associated metallic layers.
  • a protective garment comprising:
  • each plate member including 1. a first coherent layer of crystalline, non-metallic material having a hardness value of at least 8 on the Mohs scale,
  • said plate member further includes at least one other layer of said material spacedly juxtaposed to said first layer on said third layer, and at least one metallic rib projecting from said second layer and separating said first layer and said at least one other layer from each other, said at least one rib and said rim portion confining said first layer and said at least one other layer in all directions perpendicular to said common direction.
  • a bullet-resisting, substantially planar, laminar plate member comprising:
  • shock-absorbing layer having a hardness value of at least 8 on the Mohs scale and essentially consisting of crystalline inorganic material, said shock absorbing layer being superposed on said backing layer;
  • a stress-distributing layer of elastomeric material interposed between said backing layer and said shock-absorbing layer.
  • said third layer is not thicker than l millimeter.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)
  • Laminated Bodies (AREA)
US00315422A 1971-12-17 1972-12-15 Bullet-resisting armor Expired - Lifetime US3793648A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2162701A DE2162701A1 (de) 1971-12-17 1971-12-17 Bekleidungsstueck zum schutz gegen energiereiche projektile

Publications (1)

Publication Number Publication Date
US3793648A true US3793648A (en) 1974-02-26

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US00315422A Expired - Lifetime US3793648A (en) 1971-12-17 1972-12-15 Bullet-resisting armor

Country Status (6)

Country Link
US (1) US3793648A (fr)
BE (1) BE792805A (fr)
CH (1) CH560374A5 (fr)
DE (1) DE2162701A1 (fr)
FR (1) FR2170457A5 (fr)
GB (1) GB1417017A (fr)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4413357A (en) * 1979-11-07 1983-11-08 Michael Sacks Protective shields
US4760611A (en) * 1984-01-12 1988-08-02 Aluminum Company Of America Armor elements and method
US4881448A (en) * 1986-03-27 1989-11-21 Affarsverket Ffv Reactive armor arrangement
US4989267A (en) * 1989-12-26 1991-02-05 Douglas E. Watson Weighted training vest for athletic activities
US5164536A (en) * 1989-11-24 1992-11-17 Societe Europeenne De Propulsion Composite armored seat, and method of manufacture
US5191166A (en) * 1991-06-10 1993-03-02 Foster-Miller, Inc. Survivability enhancement
EP0640807A1 (fr) * 1993-08-28 1995-03-01 Tissu Rothrist AG Matériel de protection à l'épreuve des balles et des armes blanches pour gilet bindé
US5686689A (en) * 1985-05-17 1997-11-11 Aeronautical Research Associates Of Princeton, Inc. Lightweight composite armor
US6080474A (en) * 1997-10-08 2000-06-27 Hoechst Celanese Corporation Polymeric articles having improved cut-resistance
US6363527B1 (en) * 2000-04-26 2002-04-02 The Johns Hopkins Unversity Thermal control apparatus for body armor
US6497966B2 (en) * 2001-01-15 2002-12-24 Michael Cohen Laminated armor
WO2003078917A1 (fr) * 2002-03-19 2003-09-25 Krauss-Maffei Wegmann Gmbh & Co. Kg Blindage composite, s'utilisant notamment dans des automobiles
WO2006002898A1 (fr) * 2004-07-06 2006-01-12 Composhield A/S Plaque de blindage
WO2006103400A1 (fr) * 2005-03-29 2006-10-05 Armourtest Limited Ameliorations des vetements de protection ou s’y rapportant
US20090255037A1 (en) * 2008-02-14 2009-10-15 Primo Sport Holding, Llc Protective covering
US20090269552A1 (en) * 2004-07-06 2009-10-29 Composhield A/S Armour plate
US20100005555A1 (en) * 2007-05-08 2010-01-14 Osborne Kurt J Rear break away ballistics vest
US20100083428A1 (en) * 2008-10-06 2010-04-08 Mcelroy Michael Body Armor Plate Having Integrated Electronics Modules
US20100287690A1 (en) * 2009-05-18 2010-11-18 Kanavage Stanley C Compression garment combined with a customer fitted protective athletic shield
US7917967B2 (en) * 2007-05-08 2011-04-05 Survival Armor, Inc. Front break away ballistics vest
US20110173731A1 (en) * 2010-01-15 2011-07-21 Mcelroy Michael Portable electrical power source for incorporation with an armored garment
US20110315304A1 (en) * 2007-09-17 2011-12-29 Engelbart Roger W Methods and systems for fabrication of composite armor laminates by preform stitching
US20120066820A1 (en) * 2010-09-20 2012-03-22 Bernard Fresco Protective headwear and bodywear
US8434396B1 (en) 2007-07-23 2013-05-07 Verco Materials, Llc Armor arrangement
US8720314B2 (en) * 2007-09-17 2014-05-13 The Boeing Company Methods and systems for fabrication of composite armor laminates by preform stitching
US20150268007A1 (en) * 2011-06-30 2015-09-24 Israel Military Industries Ltd. Antiballistic article and method of producing same
CN106891012A (zh) * 2017-01-20 2017-06-27 东莞市佳乾新材料科技有限公司 一种轻质高强复合防弹板的制备方法
US10139201B2 (en) 2014-02-02 2018-11-27 Imi Systems Ltd. Pre-stressed curved ceramic plates/tiles and method of producing same
US10197363B1 (en) * 2017-04-03 2019-02-05 The United States Of America, As Represented By The Secretary Of The Navy Porous refractory armor substrate
CN109534827A (zh) * 2018-12-11 2019-03-29 莱芜亚赛陶瓷技术有限公司 一种预置界面热压防弹陶瓷板及其制备方法
DE202020101273U1 (de) 2020-02-21 2021-05-28 Blücher Gesellschaft mit beschränkter Haftung Modulare Schutzbekleidungseinheit sowie deren Verwendung

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4316286A (en) * 1980-03-07 1982-02-23 Klein John M Bulletproof protective plate assembly
GB2129281A (en) * 1982-10-29 1984-05-16 George Wilkins Exercising garment
GB2156272A (en) * 1984-03-17 1985-10-09 Michael Sacks Protective shields
US5157792A (en) * 1989-09-01 1992-10-27 Allen Cheryl K Body armor vest and method of manufacture
GB0526506D0 (en) * 2005-12-28 2006-02-08 Np Aerospace Ltd Protective Cover

Citations (7)

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Publication number Priority date Publication date Assignee Title
US1214517A (en) * 1916-05-03 1917-02-06 Whitfield Mfg Company Ltd Shield for the use of soldiers and others.
US2748391A (en) * 1953-03-30 1956-06-05 Jr Frederick J Lewis Missile-resistant garment
CH386292A (de) * 1960-04-29 1964-12-31 Lonza Ag Mehrschichtige Schutzvorrichtung gegen Schlag und Beschuss
US3179553A (en) * 1963-03-12 1965-04-20 Philip J Franklin Lightweight armor plate
US3592942A (en) * 1968-05-02 1971-07-13 Norton Co Composite ceramic armor
US3616115A (en) * 1968-09-24 1971-10-26 North American Rockwell Lightweight ballistic armor
US3634889A (en) * 1969-12-29 1972-01-18 Robert F Roisten Survival armor unit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1214517A (en) * 1916-05-03 1917-02-06 Whitfield Mfg Company Ltd Shield for the use of soldiers and others.
US2748391A (en) * 1953-03-30 1956-06-05 Jr Frederick J Lewis Missile-resistant garment
CH386292A (de) * 1960-04-29 1964-12-31 Lonza Ag Mehrschichtige Schutzvorrichtung gegen Schlag und Beschuss
US3179553A (en) * 1963-03-12 1965-04-20 Philip J Franklin Lightweight armor plate
US3592942A (en) * 1968-05-02 1971-07-13 Norton Co Composite ceramic armor
US3616115A (en) * 1968-09-24 1971-10-26 North American Rockwell Lightweight ballistic armor
US3634889A (en) * 1969-12-29 1972-01-18 Robert F Roisten Survival armor unit

Cited By (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4413357A (en) * 1979-11-07 1983-11-08 Michael Sacks Protective shields
US4760611A (en) * 1984-01-12 1988-08-02 Aluminum Company Of America Armor elements and method
US5686689A (en) * 1985-05-17 1997-11-11 Aeronautical Research Associates Of Princeton, Inc. Lightweight composite armor
US4881448A (en) * 1986-03-27 1989-11-21 Affarsverket Ffv Reactive armor arrangement
US5164536A (en) * 1989-11-24 1992-11-17 Societe Europeenne De Propulsion Composite armored seat, and method of manufacture
US4989267A (en) * 1989-12-26 1991-02-05 Douglas E. Watson Weighted training vest for athletic activities
US5191166A (en) * 1991-06-10 1993-03-02 Foster-Miller, Inc. Survivability enhancement
EP0640807A1 (fr) * 1993-08-28 1995-03-01 Tissu Rothrist AG Matériel de protection à l'épreuve des balles et des armes blanches pour gilet bindé
US6080474A (en) * 1997-10-08 2000-06-27 Hoechst Celanese Corporation Polymeric articles having improved cut-resistance
US6363527B1 (en) * 2000-04-26 2002-04-02 The Johns Hopkins Unversity Thermal control apparatus for body armor
US6497966B2 (en) * 2001-01-15 2002-12-24 Michael Cohen Laminated armor
WO2003078917A1 (fr) * 2002-03-19 2003-09-25 Krauss-Maffei Wegmann Gmbh & Co. Kg Blindage composite, s'utilisant notamment dans des automobiles
US20050172792A1 (en) * 2002-03-19 2005-08-11 Krauss-Maffel Wegmann Gmbh & Co. Kg Composite armor plating, particularlyfor installing in motor vehicles
WO2006002898A1 (fr) * 2004-07-06 2006-01-12 Composhield A/S Plaque de blindage
US20090269552A1 (en) * 2004-07-06 2009-10-29 Composhield A/S Armour plate
WO2006103400A1 (fr) * 2005-03-29 2006-10-05 Armourtest Limited Ameliorations des vetements de protection ou s’y rapportant
US20100050308A1 (en) * 2005-03-29 2010-03-04 Colin Roberson Protective Clothing
GB2438356B (en) * 2005-03-29 2008-07-09 Armourtest Ltd Improvements in or relating to protective clothing
GB2438356A (en) * 2005-03-29 2007-11-21 Armourtest Ltd Improvements in or relating to protective clothing
US7979917B2 (en) * 2007-05-08 2011-07-19 Survival Armor, Inc. Rear break away ballistics vest
US20100005555A1 (en) * 2007-05-08 2010-01-14 Osborne Kurt J Rear break away ballistics vest
US7917967B2 (en) * 2007-05-08 2011-04-05 Survival Armor, Inc. Front break away ballistics vest
US8434396B1 (en) 2007-07-23 2013-05-07 Verco Materials, Llc Armor arrangement
US8720314B2 (en) * 2007-09-17 2014-05-13 The Boeing Company Methods and systems for fabrication of composite armor laminates by preform stitching
US8524023B2 (en) * 2007-09-17 2013-09-03 The Boeing Company Methods and systems for fabrication of composite armor laminates by preform stitching
US20110315304A1 (en) * 2007-09-17 2011-12-29 Engelbart Roger W Methods and systems for fabrication of composite armor laminates by preform stitching
US8296862B2 (en) * 2008-02-14 2012-10-30 Warrior Sports, Inc. Protective covering
US20090255037A1 (en) * 2008-02-14 2009-10-15 Primo Sport Holding, Llc Protective covering
US7979918B2 (en) * 2008-02-14 2011-07-19 Warrior Sports, Inc. Protective covering
US20110239348A1 (en) * 2008-02-14 2011-10-06 Warrior Sports, Inc. Protective covering
US7805767B2 (en) * 2008-10-06 2010-10-05 Bae Systems Land & Armaments Body armor plate having integrated electronics modules
US20100083428A1 (en) * 2008-10-06 2010-04-08 Mcelroy Michael Body Armor Plate Having Integrated Electronics Modules
US20100287690A1 (en) * 2009-05-18 2010-11-18 Kanavage Stanley C Compression garment combined with a customer fitted protective athletic shield
US20110173731A1 (en) * 2010-01-15 2011-07-21 Mcelroy Michael Portable electrical power source for incorporation with an armored garment
US8502506B2 (en) 2010-01-15 2013-08-06 Bae Systems Aerospace & Defense Group Inc. Portable electrical power source for incorporation with an armored garment
US20120066820A1 (en) * 2010-09-20 2012-03-22 Bernard Fresco Protective headwear and bodywear
US9696122B2 (en) * 2011-06-30 2017-07-04 Imi Systems Ltd. Antiballistic article and method of producing same
US20150268007A1 (en) * 2011-06-30 2015-09-24 Israel Military Industries Ltd. Antiballistic article and method of producing same
US10139201B2 (en) 2014-02-02 2018-11-27 Imi Systems Ltd. Pre-stressed curved ceramic plates/tiles and method of producing same
US10563961B2 (en) 2014-02-02 2020-02-18 Imi Systems Ltd. Pre-stressed curved ceramic plates/tiles and method of producing same
CN106891012A (zh) * 2017-01-20 2017-06-27 东莞市佳乾新材料科技有限公司 一种轻质高强复合防弹板的制备方法
US10197363B1 (en) * 2017-04-03 2019-02-05 The United States Of America, As Represented By The Secretary Of The Navy Porous refractory armor substrate
CN109534827A (zh) * 2018-12-11 2019-03-29 莱芜亚赛陶瓷技术有限公司 一种预置界面热压防弹陶瓷板及其制备方法
CN109534827B (zh) * 2018-12-11 2021-03-12 莱芜亚赛陶瓷技术有限公司 一种预置界面热压防弹陶瓷板及其制备方法
DE202020101273U1 (de) 2020-02-21 2021-05-28 Blücher Gesellschaft mit beschränkter Haftung Modulare Schutzbekleidungseinheit sowie deren Verwendung
WO2021164891A1 (fr) 2020-02-21 2021-08-26 BLüCHER GMBH Unité modulaire de vêtement de protection et son utilisation
DE102020106293A1 (de) 2020-02-21 2021-08-26 Blücher Gesellschaft mit beschränkter Haftung Modulare Schutzbekleidungseinheit sowie deren Verwendung

Also Published As

Publication number Publication date
CH560374A5 (fr) 1975-03-27
GB1417017A (en) 1975-12-10
DE2162701A1 (de) 1973-06-28
BE792805A (fr) 1973-03-30
FR2170457A5 (fr) 1973-09-14

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