US2392215A - Bulletproof grid - Google Patents

Bulletproof grid Download PDF

Info

Publication number
US2392215A
US2392215A US563907A US56390744A US2392215A US 2392215 A US2392215 A US 2392215A US 563907 A US563907 A US 563907A US 56390744 A US56390744 A US 56390744A US 2392215 A US2392215 A US 2392215A
Authority
US
United States
Prior art keywords
series
bars
lateral faces
grid
bar
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
US563907A
Inventor
Victor R Abrams
Walter W Kennedy
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.)
Barber Colman Co
Original Assignee
Barber Colman Co
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 Barber Colman Co filed Critical Barber Colman Co
Priority to US563907A priority Critical patent/US2392215A/en
Application granted granted Critical
Publication of US2392215A publication Critical patent/US2392215A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • F41H5/023—Armour plate, or auxiliary armour plate mounted at a distance of the main armour plate, having cavities at its outer impact surface, or holes, for deflecting the projectile
    • F41H5/026—Slat armour; Nets
    • 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
    • F41H7/00—Armoured or armed vehicles
    • F41H7/02—Land vehicles with enclosing armour, e.g. tanks
    • F41H7/03—Air-pressurised compartments for crew; Means for preventing admission of noxious substances, e.g. combustion gas from gun barrels, in crew compartments; Sealing arrangements
    • F41H7/035—Gratings for ventilation openings
    • 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
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/911—Penetration resistant layer

Definitions

  • the present invention pertains to a novel bullet and spatter proof grid designed to cover a ventilation opening in an armored structure such as a combat tank.
  • the opening may be in a horizontal, vertical or intermediate plane.
  • Many of the combat tanks now in use have the ventilating opening disposed horizontally in the top and therefore exposed to fire from above. Protection of such an opening as well as a vertical opening is extremely important.
  • the object of this invention is to provide a grid adapted to dissipate the force of a bullet or its spatter, as well as explosive waves, Without permitting them to enter the enclosure.
  • Another object of the invention is to avoid serious obstruction to the air stream notwithstanding the obstruction necessarily imposed by the grid elements.
  • Figure 1 is a plan view
  • Figure 2 is a section on the line 2-2 of Figure 1.
  • the numeral I indicates a portion of an armored structure such as the top of a combat tank.
  • the structure is formed with an opening 2 for admission of air.
  • a frame 3 of a grid designed to admitair and afford protection from bullets, fragmentation and explosion waves.
  • the grid structure constituting the invention consists of a series of parallel bars so shaped and arranged as to accomplish the aforementioned object and also admit air through an efficient path.
  • the first or outer series consists of a number of spaced parallel bars 4 lying between two parallel surfaces.
  • the surface containing the upper edges of the bars is parallel to a surface passed through corresponding points of the respective bars or the surface containing the inner edges.
  • One of the characteristics of each bar is that it present a concave surface 5 facing outwardly.
  • each bar converge inwardly to a point '1, and the concave surfaces 5 are continued at the edges as convex surfaces 8 merging into the lateral faces 6.
  • a second series of somewhat similar bars Ill is provided inward of the first series, with its members alternating with those of the first series to obstruct the spaces ll between the members of the first series.
  • Each bar ID has an outwardly facing concave surface l2 and inwardly converging lateral faces l3.
  • the bars ID are of less depth than the bars 4.
  • the concave surface 12 of each bar II) is continued at each edge as a convex surface l4 merging with the adjacent lateral face IS.
  • a third series of bars I5 is mounted directly behind the bars 4.
  • Each bar l5 also has a concave outward face It; with rounded or convex longitudinal edges IT.
  • the lateral faces l8, however. preferably diverge inwardly in a manner to intercept prolongations or extensions of the faces I3 of the adjacent bars Ill.
  • spatter travels along a surface struck thereby and is not ordinarily reflected angularly therefrom.
  • a bullet or spatter striking any of the concave faces is obviously thrown outward of the grid.
  • Spatter from the faces l2 thrown against the lateral faces 6 is redirected against the surfaces 16 and thence outward.
  • spatter striking a lateral surface l3 and then directed inwardly is arrested by the intercepting surface l8.
  • Such spatter, before striking the face I3 originates in a concave surface l6 and has spent substantially all its energy immediately on striking the surface IS.
  • the construction is also a shield against explosion waves. These waves, if detrimental, travel with a velocity exceeding that of sound. At. such velocities they are not reflected from surfaces in the usual manner but rather travel along such surfaces after the fashion of bullet spatter and are dissipated in like manner before entering the enclosure.
  • a bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars .parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral faces.
  • a bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral faces, and a third series of bars disposed directly inward of the first series and having outwardly facing concave surfaces.
  • a bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral faces, and a third series of bars disposed directly inward of the first series and having outwardly facing concave surfaces and inwardly diverging lateral faces substantially parallel to the lateral faces of the second series and intercepting the prolonged planes of the last named faces.
  • a bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral faces, the lateral faces of the first series being wider than those of the second series.
  • a bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral'faces, the lateral faces of the first series being wider than those of the second series, a third series of bars disposed directly inward of the first series and having outwardly facing concave surfaces.
  • a bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral faces, the lateral faces of the first series being wider than those of the second series, a third series of bars disposed directly inward of the first series and having outwardly facing concave surfaces and inwardly diverging lateral faces substantially parallel to the lateral faces of the second series and intercepting the prolonged planes of the last named faces.
  • a bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral faces, each bar having convex longitudinal surfaces joining the edges of its concave surface to the respective lateral faces.
  • a bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral faces, and a third series of bars disposed directly inward of the first series and having outwardly facing concave surfaces and inwardly diverging lateral faces substantially parallel to the lateral faces of the second series and intercepting the prolonged planes of the last named faces, each bar having convex longitudinal surfaces joining the edges of its concave surface to the respective lateral faces.
  • VICTOR YR. ABRAMS. WALTER -W. KENNEDY.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)

Description

AND 85 FEED MVHZESQ Jam. l, 1946. v. R. ABRAMS ETAL BULLET PROOF GRID Filed Nov. 17, 1944 Vi ctnr R-Ahram5 Walter Kenna d ama/WM f fi m Patented Jan. 1, 1946 BULLETPROOF GRID Victor B. Abrams and Walter W. Kennedy, Rockford, Ill.; said Kennedy assignor to Barber- Colman Company, Rockford, 111., a corporation of Illinois Application November 17, 1944, Serial No. 563,907
8 Claims.
The present invention pertains to a novel bullet and spatter proof grid designed to cover a ventilation opening in an armored structure such as a combat tank. The opening may be in a horizontal, vertical or intermediate plane. Many of the combat tanks now in use have the ventilating opening disposed horizontally in the top and therefore exposed to fire from above. Protection of such an opening as well as a vertical opening is extremely important.
The object of this invention is to provide a grid adapted to dissipate the force of a bullet or its spatter, as well as explosive waves, Without permitting them to enter the enclosure. Another object of the invention is to avoid serious obstruction to the air stream notwithstanding the obstruction necessarily imposed by the grid elements. These objects are accomplished by the use of a series of parallel grid bars having a unique configuration. In general, each bar is formed with an outwardly directed concave surface and with inwardly converging lateral faces extending therefrom. Bullet spatter from a lateral face is received in the concave face of the next inner bar and thus directed outwardly, Direct hits are stopped by the concave faces, and the series of bars are arranged in staggered relation to prevent entry of an angular hit. The edges of the bars, along the concave faces, are rounded; and the combination of rounded edges and flat lateral faces of adjacent bars forms an efficient air flow path.
An illustrative embodiment of the invention is disclosed in the following description and in the accompanying drawing in which:
Figure 1 is a plan view, and
Figure 2 is a section on the line 2-2 of Figure 1.
The numeral I indicates a portion of an armored structure such as the top of a combat tank. The structure is formed with an opening 2 for admission of air. In the opening is mounted a frame 3 of a grid designed to admitair and afford protection from bullets, fragmentation and explosion waves.
The grid structure constituting the invention consists of a series of parallel bars so shaped and arranged as to accomplish the aforementioned object and also admit air through an efficient path. The first or outer series consists of a number of spaced parallel bars 4 lying between two parallel surfaces. Thus, the surface containing the upper edges of the bars is parallel to a surface passed through corresponding points of the respective bars or the surface containing the inner edges. One of the characteristics of each bar is that it present a concave surface 5 facing outwardly.
The term is used in its broad sense and is not limited to a curved surface. Actually the outer surface in dihedral, but the important characteristic is that it forms a pocket facing outwardly in the nature of a concave surface. The side wall 6 of each bar converge inwardly to a point '1, and the concave surfaces 5 are continued at the edges as convex surfaces 8 merging into the lateral faces 6.
A second series of somewhat similar bars Ill is provided inward of the first series, with its members alternating with those of the first series to obstruct the spaces ll between the members of the first series. Each bar ID has an outwardly facing concave surface l2 and inwardly converging lateral faces l3. The bars ID are of less depth than the bars 4. The concave surface 12 of each bar II) is continued at each edge as a convex surface l4 merging with the adjacent lateral face IS.
A third series of bars I5 is mounted directly behind the bars 4. Each bar l5 also has a concave outward face It; with rounded or convex longitudinal edges IT. The lateral faces l8, however. preferably diverge inwardly in a manner to intercept prolongations or extensions of the faces I3 of the adjacent bars Ill.
In examining the path of bullet spatter in the grid, it will be borne in mind that spatter travels along a surface struck thereby and is not ordinarily reflected angularly therefrom. A bullet or spatter striking any of the concave faces is obviously thrown outward of the grid. Spatter from the faces l2 thrown against the lateral faces 6 is redirected against the surfaces 16 and thence outward. spatter striking a lateral surface l3 and then directed inwardly is arrested by the intercepting surface l8. Such spatter, before striking the face I3, originates in a concave surface l6 and has spent substantially all its energy immediately on striking the surface IS.
The staggered relation of the bars ID to the bars 4 and IS, in conjunction with the sloping lateral faces and the rounded edges, forms a comparatively efficient air flow path as indicated by the numeral IS in Figure 2. It is now evident that the described configuration and arrangement of the bars does not materially obstruct the flow of air while, nevertheless, affording complete protection against bullet and spatter in the manner already described.
The construction is also a shield against explosion waves. These waves, if detrimental, travel with a velocity exceeding that of sound. At. such velocities they are not reflected from surfaces in the usual manner but rather travel along such surfaces after the fashion of bullet spatter and are dissipated in like manner before entering the enclosure.
While specific embodiments of the invention have been shown and been described, it will be understood that various alterations may be made without departure from the spirit of the invention as indicated by the appended claims.
What I claim is:
1. A bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars .parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral faces.
2. A bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral faces, and a third series of bars disposed directly inward of the first series and having outwardly facing concave surfaces.
3. A bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral faces, and a third series of bars disposed directly inward of the first series and having outwardly facing concave surfaces and inwardly diverging lateral faces substantially parallel to the lateral faces of the second series and intercepting the prolonged planes of the last named faces.
4. A bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral faces, the lateral faces of the first series being wider than those of the second series.
5. A bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral'faces, the lateral faces of the first series being wider than those of the second series, a third series of bars disposed directly inward of the first series and having outwardly facing concave surfaces.
6. A bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral faces, the lateral faces of the first series being wider than those of the second series, a third series of bars disposed directly inward of the first series and having outwardly facing concave surfaces and inwardly diverging lateral faces substantially parallel to the lateral faces of the second series and intercepting the prolonged planes of the last named faces.
7. A bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral faces, each bar having convex longitudinal surfaces joining the edges of its concave surface to the respective lateral faces.
8. A bullet-proof grid comprising an open frame member, a series of spaced parallel bars secured in said member, a second series of bars parallel to the first series and displaced inwardly therefrom and alternating therewith, each bar having an outwardly facing concave surface and a pair of inwardly converging lateral faces, and a third series of bars disposed directly inward of the first series and having outwardly facing concave surfaces and inwardly diverging lateral faces substantially parallel to the lateral faces of the second series and intercepting the prolonged planes of the last named faces, each bar having convex longitudinal surfaces joining the edges of its concave surface to the respective lateral faces.
VICTOR. YR. ABRAMS. WALTER -W. KENNEDY.
US563907A 1944-11-17 1944-11-17 Bulletproof grid Expired - Lifetime US2392215A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US563907A US2392215A (en) 1944-11-17 1944-11-17 Bulletproof grid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US563907A US2392215A (en) 1944-11-17 1944-11-17 Bulletproof grid

Publications (1)

Publication Number Publication Date
US2392215A true US2392215A (en) 1946-01-01

Family

ID=24252372

Family Applications (1)

Application Number Title Priority Date Filing Date
US563907A Expired - Lifetime US2392215A (en) 1944-11-17 1944-11-17 Bulletproof grid

Country Status (1)

Country Link
US (1) US2392215A (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2492294A (en) * 1947-04-08 1949-12-27 Barber Colman Co Air entrance grid
DE1098412B (en) * 1957-04-03 1961-01-26 Wira G M B H Armored vehicle with double armor
DE1119724B (en) * 1959-02-04 1961-12-14 Bofors Ab Protection device to reduce the effects of HE shells
DE1159816B (en) * 1961-12-16 1963-12-19 Henschel Werke Ag Tank raiding
DE1192079B (en) * 1963-04-13 1965-04-29 Rheinstahl Hanomag Ag Device for the bulletproof covering of the ventilation and air inlet and outlet openings in armored vehicles
DE1244021B (en) * 1964-09-07 1967-07-06 Blohm Voss Ag Splinter and bulletproof ventilation device for vehicles that can be locked on all sides
US3995566A (en) * 1974-09-14 1976-12-07 Strobl Gustav L Bulletproof baffle arrangement
US4347796A (en) * 1976-06-24 1982-09-07 The United States Of America As Represented By The Secretary Of The Army Blast suppressive shielding
US4709659A (en) * 1985-09-30 1987-12-01 Norment Industries, Inc. Ballistic and forced entry resistant barrier
US5452641A (en) * 1994-04-07 1995-09-26 Fmc Corporation Transparent armor piercing protection system
DE4106566A1 (en) * 1988-06-29 1998-01-15 Francois Conversy Shelter against direct impact of conventional missile
US20090023375A1 (en) * 2007-07-20 2009-01-22 H2Gen Innovations, Inc. Apparatus and method for providing detonation damage resistance in ductwork
FR2953921A1 (en) * 2009-12-14 2011-06-17 Nexter Systems Ballistic safeguard shield for protecting e.g. motor in armored vehicle, has primary and secondary metallic blades arranged parallel to each other, where secondary blades are distributed along pitch between primary blades
US8424443B2 (en) 2011-01-31 2013-04-23 The United States Of America As Represented By The Secretary Of The Army Vented armor V structure
US20130160640A1 (en) * 2010-09-02 2013-06-27 Bae Systems Plc Armour assembly
US20150226526A1 (en) * 2013-04-18 2015-08-13 Plasan Sasa Ltd. Hybrid slat armor
EP2806245B1 (en) 2013-05-25 2017-12-20 Diehl Defence GmbH & Co. KG Protective device against projectiles

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2492294A (en) * 1947-04-08 1949-12-27 Barber Colman Co Air entrance grid
DE1098412B (en) * 1957-04-03 1961-01-26 Wira G M B H Armored vehicle with double armor
DE1119724B (en) * 1959-02-04 1961-12-14 Bofors Ab Protection device to reduce the effects of HE shells
DE1159816B (en) * 1961-12-16 1963-12-19 Henschel Werke Ag Tank raiding
DE1192079B (en) * 1963-04-13 1965-04-29 Rheinstahl Hanomag Ag Device for the bulletproof covering of the ventilation and air inlet and outlet openings in armored vehicles
DE1244021B (en) * 1964-09-07 1967-07-06 Blohm Voss Ag Splinter and bulletproof ventilation device for vehicles that can be locked on all sides
US3995566A (en) * 1974-09-14 1976-12-07 Strobl Gustav L Bulletproof baffle arrangement
US4347796A (en) * 1976-06-24 1982-09-07 The United States Of America As Represented By The Secretary Of The Army Blast suppressive shielding
US4709659A (en) * 1985-09-30 1987-12-01 Norment Industries, Inc. Ballistic and forced entry resistant barrier
DE4106566A1 (en) * 1988-06-29 1998-01-15 Francois Conversy Shelter against direct impact of conventional missile
FR2718520A1 (en) * 1994-04-07 1995-10-13 Fmc Corp Transparent armor puncture protection system.
US5452641A (en) * 1994-04-07 1995-09-26 Fmc Corporation Transparent armor piercing protection system
US20090023375A1 (en) * 2007-07-20 2009-01-22 H2Gen Innovations, Inc. Apparatus and method for providing detonation damage resistance in ductwork
US8231445B2 (en) * 2007-07-20 2012-07-31 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Apparatus and method for providing detonation damage resistance in ductwork
FR2953921A1 (en) * 2009-12-14 2011-06-17 Nexter Systems Ballistic safeguard shield for protecting e.g. motor in armored vehicle, has primary and secondary metallic blades arranged parallel to each other, where secondary blades are distributed along pitch between primary blades
US20130160640A1 (en) * 2010-09-02 2013-06-27 Bae Systems Plc Armour assembly
US9470481B2 (en) * 2010-09-02 2016-10-18 Bae Systems Plc Armor assembly
US8424443B2 (en) 2011-01-31 2013-04-23 The United States Of America As Represented By The Secretary Of The Army Vented armor V structure
US8459167B1 (en) 2011-01-31 2013-06-11 The United States Of America As Represented By The Secretary Of The Army Vented armor V structure
US20150226526A1 (en) * 2013-04-18 2015-08-13 Plasan Sasa Ltd. Hybrid slat armor
US9404716B2 (en) * 2013-04-18 2016-08-02 Plasan Sasa Ltd. Hybrid slat armor
EP2806245B1 (en) 2013-05-25 2017-12-20 Diehl Defence GmbH & Co. KG Protective device against projectiles

Similar Documents

Publication Publication Date Title
US2392215A (en) Bulletproof grid
CA1268646A (en) Reactive armour wall structure
US20130092016A1 (en) Device for Mitigating the Effects of Explosive Events
EP0860678B1 (en) Armour in particular for vehicle
US2077729A (en) Ship's armor
US4598647A (en) Shrapnel proof door frame
US3137205A (en) Device for protection against bursting projectiles
US3592942A (en) Composite ceramic armor
GB2375587A (en) Armour panel
US20140373707A1 (en) Arrangement for the protection of an object, especially of a motor vehicle, against approaching projectiles
GB2191275A (en) Composite armour
US4709659A (en) Ballistic and forced entry resistant barrier
US3995566A (en) Bulletproof baffle arrangement
US20110168000A1 (en) Ballistic wall panel device and system and method therefor
US2492294A (en) Air entrance grid
CN210773686U (en) Civil concealed knife-proof bulletproof hat
US2406047A (en) Protection against bullet spatter
US860378A (en) Armored defense.
SE535388C2 (en) Device for protection against RSV grenades and vehicles with such device
WO1991012483A1 (en) Armor plate
US1314513A (en) Leonard donahue
US1859013A (en) Speaking aperture fixture
RU2068977C1 (en) Armor protection
US1521393A (en) Speech vent
DE2612673C1 (en) Shield for protecting military targets