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US1786985A
|
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Magnetic pickup
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US1735861A
|
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Tuned radial horn
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US1735862A
|
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Push-pull-actuated radial resonator
|
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US1735863A
|
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Radial resonator with bass-note propagator
|
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US1759557A
|
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Plural-conductor actuating unit
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US1718357A
|
|
Mechanical movement for sound propagation
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US1696304A
|
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Multituned horn
|
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US1767679A
|
|
Truncated horn speaker having plurality of chambers
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US1784596A
|
|
Closed-end resonating horn
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US1814554A
|
|
Horn having resonating chambers at antinodal points
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US1718356A
|
|
Sound-reproducing device
|
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US1735860A
|
|
Flexed sounding board
|
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US1696305A
|
|
Electromagnetic sounding-board actuator
|
|
US1767678A
|
|
Sounding board
|
|
US1787002A
|
|
Reenforced sounding board
|
|
US1685086A
|
|
Loud-speaker unit
|
|
US1718355A
|
|
Recording and reproducing sound
|
|
US1784595A
|
|
Acoustic device
|
|
US1818960A
|
|
Method and means for producing compressional waves
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|
US1735859A
|
|
Loud-speaker
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