US2337213A - Pressure control loud-speaker enclosure - Google Patents

Pressure control loud-speaker enclosure Download PDF

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US2337213A
US2337213A US417677A US41767741A US2337213A US 2337213 A US2337213 A US 2337213A US 417677 A US417677 A US 417677A US 41767741 A US41767741 A US 41767741A US 2337213 A US2337213 A US 2337213A
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enclosure
loud speaker
sides
housing
sound
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US417677A
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Jr Joseph Topping
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2884—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure
    • H04R1/2888—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure for loudspeaker transducers

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  • This invention relates to improvements in enclosures for loud speakers, and its primary object is to provide an improved enclosure for cone-type loud speakers, having a construction capable of acoustically locking mechanical vibrations at the source of audio sound vibrations, eliminating enclosure pressure disturbance of the original wave form and permitting sound vibration movement into free space without pressure re-shaping and resistance to coil movement.
  • Another object of my invention is to provide an improved loud speaker enclosure having a built-in acoustic network construction which is capable of improving the performance of a conetype loud speaker over its entire response range.
  • a further object of my invention is to provide an improved loud speaker enclosure having a builtin acoustic network which increases considerably the operating efliciency of the loud speaker it encloses.
  • Fig. 1 is a perspective view illustrating an enclosure for cone-type loud speakers, embodying l front side thereof removed;
  • Fig. 3 is a sectional view taken on the line 3-' o! Fig. 2;
  • Fig. 4 is a sectional view taken on the line 4-4 o! Fig. 2;
  • Fig. 5 is a rear view showing parts of the enclosure broken away and in section.
  • my invention comprises a cabinet or enclosure which is of general triangular shape in horizontal cross section.
  • the enclosure is made up of substantially paralle1 top and bottom sides 2 and 3, two angularly disposed sides 4 and 6, which converge toward and are Joined together or to a narrow rear side 8, and a vto the buiTer bafile II.
  • front side 1 having a centrally disposed circular opening 8 through which a cone-type loud speaker 9 is adapted to extend.
  • a bezel Ill which carries the loud speaker.
  • the upper and lower edges o! the buffer baille II are spaced from the enclosures top and bottom sides 2 and 3, thereby providing upper and lower passageways connecting a rear compartment I2 located between the said buffer baiiie and the rear side 6 with forwardly disposed upper and lower compartments I3 and I4.
  • partitions or baves I5 Positioned in the upper part of the enclosure and partially enclosing the upper compartment I3 are two partitions or baves I5 which extend across the converging corners formed at the juncture of the top 2 with the sides 4 and 5 and which are angularly disposed to one another as well as with respect to the sides 4 and 5, the' top 2 and the buffer baiiie Il.
  • the partitions I5 at their side edges are secured to one another, to the top side 2, to the angular sides 4 and Sand to the buffer baille II.
  • the forwardly disposed side edges of the partitions I5 abut the front side l of the enclosure.
  • the angular position of the partitions I5 is such that the upper compartment I3 is divided into two substantially triangular shaped areas which are joined together at their rear ends, the said joined ends being connected to the upper end of the rear compartment I2.
  • Suitable air holes I5 are provided in the partitions I5 for the passage of sound vibrations from the .front chamber within which the loud speaker is housed to the upper compartment I3.
  • partitions or baves IB Positioned in the lower part of the enclosure and partially enclosing the lower compartment I4 are two partitions or baves IB which extend across the converging corners formed at the juncture of the bottom 3 with the sides 4 and 5 and which are angularly disposed to one another as well as with respect to sides 4 and 5, the bottom 3, the buffer baille II and the upper partitions I5.
  • the partitions Il at their side edges are secured to one another, to the bottom side 3, to the angular sides 4 and I of the enclosure,'and The forwardly disposed side edges of the partitions IB abut the front side 'l of the enclosure.
  • the angular position of the partitions I6 is such that the lower compartment I4 is' divided into two substantially triangular shaped areas which are joined together at their rear ends, the said joined ends being connected to the lower end of the rear compartment I2.
  • Suitable air holes I6' are provided in the partitions I6 for the passage of sound waves from the front chamber wherein the loud speaker is housed to the lower compartment I4.
  • Dividing the rear compartment l2 into a number of areas are substantially horizontal barangers Il, each having an air hole Il of suitable size and shape for the passage of sound vibrations from one area of the said compartment to another.
  • the air holes Il are in staggered relationship with respect to one another so that sound waves passing from one area of the rear compartment I2 to another cannot do so without rst encountering one of the bailes Il.
  • the series of partitions, baffles and triangular shaped compartments, being positioned in the manner illustrated serve to break up and finally cancel the slow and sustained sound waves set in motion in the enclosure by the loud speaker.
  • Another function of the series of partitions, crizs and triangular shaped compartments is that of frequency response control with respect to mass motion of the total cone or cones used.
  • the structure comprising the present invention functions in such a manner that the performance of a cone-type loud speaker over its entire response range is considerably improved, thereby materially increasing its operating efficiency.
  • a denite dimensional characteristic is obtained through the cancellation of the loud speakers back-wave motion, an important phenomenon in the production of natural tones, this being accomplished by reducing to a minimum the wall or surface reflections and lower frequency distortion.
  • An enclosure embodying the principles of this invention being adapted to cancel those sound vibrations ordinarily impairing the natural tones produced by loud speakers, constitutes a distinct improvement over the transducer or microphone housings now commonly used.
  • a housing comprising a substantially triangular top and bottom, two rearwardly converging sides connected to the top and bottom, and upper and lower baves extending across the converging corners formed at the juncture of the sides with the top and bottom, each barier having an air opening for the passage of sound vibrations rearwardly VVto the space at the converging corners.
  • a housing comprising a Vsubstantially triangular top and bottom, two rearwardly converging sides secured to and disposed between the top and bottom, a front side having a sound opening secured to the top, the bottom and the sides, an upper pair of bales having air openings extending across the upper converging corners formed at the juncture of the top with the sides, and a lower pair of baiies having air openings extending across the lower converging corners extending at the juncture of the bottom with the sides.
  • a housing comprising a substantially triangular top and bottom, two rearwardly converging sides joined to and disposed between the top and the bottom, a front side having a sound opening for the forward movement of sound vibrations from a. loud speaker positioned in the housing, an upper pair of perforated bales extending across the upper converging corners formed at the juncture of the top with the sides, a lower pair of perforated ballles extending across the lower converging corners formed at the juncture of the bottom with the sides, and a substantially vertical baflie extending across the rear corner of the housing formed by the converging sides.
  • a housing comprising a substantially triangular top and bottom, two rearwardly converging sides joined to and disposed between the top and the bottom, a front side having a sound opening for the forward movement of sound vibrations from a loud speaker positioned in the housing, an upper pair of perforated articless extending across the upper converging corners formed at the juncture of the top with the sides, a lower pair of perforated bailies extending across the lower converging coi'- ners formed at the juncture of the bottom with thesides, a substantially vertical baille extending across the rear corner of the housing, and one or more substantially horizontal perforated baffles dividing the space between the vertical barile and the converging sides into two or more connected chambers.
  • a housing which in horizontal cross section is substantially triangular in shape, having an opening for the outward movement of sound waves from a loud speaker mounted in the housing, and a series of articless having air openings, the said bailles being arranged across the corners of the housing to provide a number of interconnected compartments of substantially triangular shape for the movement of sound waves from the loud speaker.
  • a housing which in horizontal cross section is of general triangular shape, a balile mounted at the front side of the housing having a sound opening for the outward movement of sound Waves from a loud speaker normally positioned in the enclosure, upper and lower pairs of angularly disposed bailles positioned in the housing across the converging corners thereof, each having an air opening for the passage of sound waves directed rearwardly from the loud speaker, and a series of interconnected compartments formed in the enclosure by the baffles and the sides of the enclosure, the said bailles and compartments forming an acoustic structure for cancelling the rearwardly directed sound waves from the loud speaker.
  • a housing comprisingfive sides, two of which form the top and bottom of the enclosure and are in substantially parallel relationship and are of general triangular shape, and the other three of which form the front and the lateral sides of the enclosure and are arranged in triangular formation with their side edges joined one to another and their opposite ends secured to the side edges of the top and bottom sides, the front side having a sound opening for the outward movement; of sound waves from a loud speaker positioned in the housing, and an acoustic structure within the housing for cancelling sound waves moving rearwardly from the loud speaker, the said acoustic structure comprising upper and lower pairs of angularly disposed batflespositioned in the housing across the converging corners thereof, also a rear vertical barier extending across the rear corner of the housing, the said upper and lower bafeshaving air openings therein.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Description

J. TOPPING, JR
PRESSURE CONTROL LOUD SPEAKER ENcLOsURE Filed Nov. 5, 1941 IF'EL Dec. 2l, 1943.
Patented Dec. 2l, 1943 PRESSURE CONTROL LOUD-SPEAKER ENCLOSUBE Joseph Topping, Jr., San Francisco, Calif.
Application November 3, 1941, Serial No. 417,677 7 Claims. ('Cl. 181-31) This invention relates to improvements in enclosures for loud speakers, and its primary object is to provide an improved enclosure for cone-type loud speakers, having a construction capable of acoustically locking mechanical vibrations at the source of audio sound vibrations, eliminating enclosure pressure disturbance of the original wave form and permitting sound vibration movement into free space without pressure re-shaping and resistance to coil movement.
Another object of my invention is to provide an improved loud speaker enclosure having a built-in acoustic network construction which is capable of improving the performance of a conetype loud speaker over its entire response range.
A further object of my invention is to provide an improved loud speaker enclosure having a builtin acoustic network which increases considerably the operating efliciency of the loud speaker it encloses.
Other and further objects of my invention will be pointed out hereinafter, or will be indicated in the appended claims, or will be obvious to one skilled in the art upon an understanding of the present disclosure. For the purpose of this application I have elected to show herein certain forms and details of a loud speaker housing representative of my invention; it is to be understood, however, that the embodiments of my invention herein shown and described are for the purpose of illustration only, and that therefore it is not to be regarded as exhaustive of the variations of the invention, nor is it to be given an interpretation such as might have the effect of limiting the claims short of the most comprehensive scope of the invention in the art.
In the accompanying drawing:
Fig. 1 is a perspective view illustrating an enclosure for cone-type loud speakers, embodying l front side thereof removed;
Fig. 3 is a sectional view taken on the line 3-' o! Fig. 2;
Fig. 4 is a sectional view taken on the line 4-4 o! Fig. 2; and
Fig. 5 is a rear view showing parts of the enclosure broken away and in section.
In its vpreferred form my invention comprises a cabinet or enclosure which is of general triangular shape in horizontal cross section. The enclosure is made up of substantially paralle1 top and bottom sides 2 and 3, two angularly disposed sides 4 and 6, which converge toward and are Joined together or to a narrow rear side 8, and a vto the buiTer bafile II.
front side 1 having a centrally disposed circular opening 8 through which a cone-type loud speaker 9 is adapted to extend. suitably secured to the iront side l is a bezel Ill which carries the loud speaker. Secured at its lateral side edges to the angular sides 4 and 5 and positioned directly to the rear of the central opening 8 is a buffer baille II. The upper and lower edges o! the buffer baille II are spaced from the enclosures top and bottom sides 2 and 3, thereby providing upper and lower passageways connecting a rear compartment I2 located between the said buffer baiiie and the rear side 6 with forwardly disposed upper and lower compartments I3 and I4. Positioned in the upper part of the enclosure and partially enclosing the upper compartment I3 are two partitions or baiiles I5 which extend across the converging corners formed at the juncture of the top 2 with the sides 4 and 5 and which are angularly disposed to one another as well as with respect to the sides 4 and 5, the' top 2 and the buffer baiiie Il. The partitions I5 at their side edges are secured to one another, to the top side 2, to the angular sides 4 and Sand to the buffer baille II. The forwardly disposed side edges of the partitions I5 abut the front side l of the enclosure. The angular position of the partitions I5 is such that the upper compartment I3 is divided into two substantially triangular shaped areas which are joined together at their rear ends, the said joined ends being connected to the upper end of the rear compartment I2. Suitable air holes I5 are provided in the partitions I5 for the passage of sound vibrations from the .front chamber within which the loud speaker is housed to the upper compartment I3.
Positioned in the lower part of the enclosure and partially enclosing the lower compartment I4 are two partitions or baiiles IB which extend across the converging corners formed at the juncture of the bottom 3 with the sides 4 and 5 and which are angularly disposed to one another as well as with respect to sides 4 and 5, the bottom 3, the buffer baille II and the upper partitions I5. The partitions Il at their side edges are secured to one another, to the bottom side 3, to the angular sides 4 and I of the enclosure,'and The forwardly disposed side edges of the partitions IB abut the front side 'l of the enclosure. The angular position of the partitions I6 is such that the lower compartment I4 is' divided into two substantially triangular shaped areas which are joined together at their rear ends, the said joined ends being connected to the lower end of the rear compartment I2.
Suitable air holes I6' are provided in the partitions I6 for the passage of sound waves from the front chamber wherein the loud speaker is housed to the lower compartment I4.
Dividing the rear compartment l2 into a number of areas are substantially horizontal baiiles Il, each having an air hole Il of suitable size and shape for the passage of sound vibrations from one area of the said compartment to another. `The air holes Il are in staggered relationship with respect to one another so that sound waves passing from one area of the rear compartment I2 to another cannot do so without rst encountering one of the bailes Il.
The series of partitions, baffles and triangular shaped compartments, being positioned in the manner illustrated serve to break up and finally cancel the slow and sustained sound waves set in motion in the enclosure by the loud speaker. Another function of the series of partitions, baies and triangular shaped compartments is that of frequency response control with respect to mass motion of the total cone or cones used. The structure comprising the present invention functions in such a manner that the performance of a cone-type loud speaker over its entire response range is considerably improved, thereby materially increasing its operating efficiency. A denite dimensional characteristic is obtained through the cancellation of the loud speakers back-wave motion, an important phenomenon in the production of natural tones, this being accomplished by reducing to a minimum the wall or surface reflections and lower frequency distortion. By providing within the enclosure suitable pressure control means, over-excursion of the moving cone is unlikely, thereby confining the wave motion distortion content to the coil of the loud speaker located at the center of the cone, and to the electrical circuit. 'I'he operating life of the loud speaker is thereby materially prolonged. Inasmuch as the cone-type loud speaker is completely housed and sealed within the enclosure, an over all and material reduction of mechanical sound vibrations is accomplished, thereby permitting a further improvement of the general sound reproduction and a reduction of vibrating action having a detrimental effect with respect to operating components of the associated mechanical, electrical and electronic instruments of the loud speaking device.
An enclosure embodying the principles of this invention, being adapted to cancel those sound vibrations ordinarily impairing the natural tones produced by loud speakers, constitutes a distinct improvement over the transducer or microphone housings now commonly used.
Having described my invention, what I claim is:
1. In a loud speaker enclosure for cancelling rearwardly moving sound vibrations, a housing comprising a substantially triangular top and bottom, two rearwardly converging sides connected to the top and bottom, and upper and lower baiiles extending across the converging corners formed at the juncture of the sides with the top and bottom, each baiile having an air opening for the passage of sound vibrations rearwardly VVto the space at the converging corners.
2.,.In a loud speaker enclosure for cancelling rearwardly moving sound vibrations, a housing comprising a Vsubstantially triangular top and bottom, two rearwardly converging sides secured to and disposed between the top and bottom, a front side having a sound opening secured to the top, the bottom and the sides, an upper pair of bales having air openings extending across the upper converging corners formed at the juncture of the top with the sides, and a lower pair of baiies having air openings extending across the lower converging corners extending at the juncture of the bottom with the sides.
3. In a loud speaker enclosure for cancelling rearwardly moving sound vibrations, a housing comprising a substantially triangular top and bottom, two rearwardly converging sides joined to and disposed between the top and the bottom, a front side having a sound opening for the forward movement of sound vibrations from a. loud speaker positioned in the housing, an upper pair of perforated bales extending across the upper converging corners formed at the juncture of the top with the sides, a lower pair of perforated ballles extending across the lower converging corners formed at the juncture of the bottom with the sides, and a substantially vertical baflie extending across the rear corner of the housing formed by the converging sides.
4. In a loud speaker enclosure for cancelling rearwardly moving sound vibrations, a housing comprising a substantially triangular top and bottom, two rearwardly converging sides joined to and disposed between the top and the bottom, a front side having a sound opening for the forward movement of sound vibrations from a loud speaker positioned in the housing, an upper pair of perforated baies extending across the upper converging corners formed at the juncture of the top with the sides, a lower pair of perforated bailies extending across the lower converging coi'- ners formed at the juncture of the bottom with thesides, a substantially vertical baille extending across the rear corner of the housing, and one or more substantially horizontal perforated baffles dividing the space between the vertical barile and the converging sides into two or more connected chambers.
5. In a loud speaker enclosure for cancelling rearwardly moving sound vibrations, a housing which in horizontal cross section is substantially triangular in shape, having an opening for the outward movement of sound waves from a loud speaker mounted in the housing, and a series of baies having air openings, the said bailles being arranged across the corners of the housing to provide a number of interconnected compartments of substantially triangular shape for the movement of sound waves from the loud speaker.
6. In a loud speaker enclosure for cancelling rearwardly moving sound vibrations, a housing which in horizontal cross section is of general triangular shape, a balile mounted at the front side of the housing having a sound opening for the outward movement of sound Waves from a loud speaker normally positioned in the enclosure, upper and lower pairs of angularly disposed bailles positioned in the housing across the converging corners thereof, each having an air opening for the passage of sound waves directed rearwardly from the loud speaker, and a series of interconnected compartments formed in the enclosure by the baffles and the sides of the enclosure, the said bailles and compartments forming an acoustic structure for cancelling the rearwardly directed sound waves from the loud speaker.
7. In a loud speaker enclosure, a housing comprisingfive sides, two of which form the top and bottom of the enclosure and are in substantially parallel relationship and are of general triangular shape, and the other three of which form the front and the lateral sides of the enclosure and are arranged in triangular formation with their side edges joined one to another and their opposite ends secured to the side edges of the top and bottom sides, the front side having a sound opening for the outward movement; of sound waves from a loud speaker positioned in the housing, and an acoustic structure within the housing for cancelling sound waves moving rearwardly from the loud speaker, the said acoustic structure comprising upper and lower pairs of angularly disposed batflespositioned in the housing across the converging corners thereof, also a rear vertical baiile extending across the rear corner of the housing, the said upper and lower bafeshaving air openings therein.
JOSEPH TOPPING, JR.
US417677A 1941-11-03 1941-11-03 Pressure control loud-speaker enclosure Expired - Lifetime US2337213A (en)

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544742A (en) * 1946-12-31 1951-03-13 Vibra Sonic Inc Cubic loud-speaker cabinet
US2552309A (en) * 1947-10-10 1951-05-08 Rca Corp Acoustic diaphragm and baffle
US2692331A (en) * 1952-12-05 1954-10-19 John B Brady Radio receiving and sound reproducing apparatus
US2722990A (en) * 1949-11-08 1955-11-08 Decca Record Co Ltd Loudspeaker assemblies
US2731101A (en) * 1952-06-06 1956-01-17 Paul W Klipsch Loud speaker
US2766839A (en) * 1953-03-16 1956-10-16 Research Corp Loudspeaker system
US2787332A (en) * 1952-09-06 1957-04-02 Norman C Fulmer Loud-speaker system
US2792069A (en) * 1952-04-21 1957-05-14 Jr Edward J Gately Loud speaker cabinet including a horn
US2806546A (en) * 1954-01-08 1957-09-17 Clarence B Galyon Speaker acoustic box
US2806547A (en) * 1954-01-11 1957-09-17 Robert L Sewell Enclosures for sound reproduction
US2834423A (en) * 1954-09-01 1958-05-13 Robert L Bradford High fidelity loud speaker enclosure
US2904123A (en) * 1956-09-27 1959-09-15 Nigro John Loud-speaker enclosures
US3247926A (en) * 1964-09-14 1966-04-26 Edwin G Warman Loud-speaker enclosure
US4972633A (en) * 1989-06-26 1990-11-27 Wright Darrow D Corner-mounted shield
USD431551S (en) * 1999-06-18 2000-10-03 Wegner Arthur C Speaker system
US20100294587A1 (en) * 2009-05-22 2010-11-25 Audible Technology, Llc Tetrahedral Loudspeaker
US20110024226A1 (en) * 2009-07-29 2011-02-03 Klein Daniel B Speaker cabinet system
US8157049B1 (en) * 2009-05-22 2012-04-17 Meyer Derek W Trirectangular tetrahedral subwoofer
US20120306335A1 (en) * 2011-06-03 2012-12-06 Kendall Howard L.L.C. Corner-Mount Electronics Cabinet
USD888796S1 (en) * 2018-06-20 2020-06-30 Axis Ab Camera

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544742A (en) * 1946-12-31 1951-03-13 Vibra Sonic Inc Cubic loud-speaker cabinet
US2552309A (en) * 1947-10-10 1951-05-08 Rca Corp Acoustic diaphragm and baffle
US2722990A (en) * 1949-11-08 1955-11-08 Decca Record Co Ltd Loudspeaker assemblies
US2792069A (en) * 1952-04-21 1957-05-14 Jr Edward J Gately Loud speaker cabinet including a horn
US2731101A (en) * 1952-06-06 1956-01-17 Paul W Klipsch Loud speaker
US2787332A (en) * 1952-09-06 1957-04-02 Norman C Fulmer Loud-speaker system
US2692331A (en) * 1952-12-05 1954-10-19 John B Brady Radio receiving and sound reproducing apparatus
US2766839A (en) * 1953-03-16 1956-10-16 Research Corp Loudspeaker system
US2806546A (en) * 1954-01-08 1957-09-17 Clarence B Galyon Speaker acoustic box
US2806547A (en) * 1954-01-11 1957-09-17 Robert L Sewell Enclosures for sound reproduction
US2834423A (en) * 1954-09-01 1958-05-13 Robert L Bradford High fidelity loud speaker enclosure
US2904123A (en) * 1956-09-27 1959-09-15 Nigro John Loud-speaker enclosures
US3247926A (en) * 1964-09-14 1966-04-26 Edwin G Warman Loud-speaker enclosure
US4972633A (en) * 1989-06-26 1990-11-27 Wright Darrow D Corner-mounted shield
USD431551S (en) * 1999-06-18 2000-10-03 Wegner Arthur C Speaker system
US20100294587A1 (en) * 2009-05-22 2010-11-25 Audible Technology, Llc Tetrahedral Loudspeaker
US7931116B2 (en) * 2009-05-22 2011-04-26 Audible Technology, Llc Tetrahedral loudspeaker
US8157049B1 (en) * 2009-05-22 2012-04-17 Meyer Derek W Trirectangular tetrahedral subwoofer
US20110024226A1 (en) * 2009-07-29 2011-02-03 Klein Daniel B Speaker cabinet system
US8104569B2 (en) * 2009-07-29 2012-01-31 Klein Daniel B Speaker cabinet system
US20120306335A1 (en) * 2011-06-03 2012-12-06 Kendall Howard L.L.C. Corner-Mount Electronics Cabinet
US8894161B2 (en) * 2011-06-03 2014-11-25 Kendall Howard L.L.C. Corner-mount electronics cabinet
USD888796S1 (en) * 2018-06-20 2020-06-30 Axis Ab Camera
USD888797S1 (en) * 2018-06-20 2020-06-30 Axis Ab Camera

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