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US1909504A
|
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Production of sound records
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US1874711A
|
|
Ore skip and the like
|
|
US1956626A
|
|
Translucent sound record
|
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US1855201A
|
|
Sound recording device
|
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US1764120A
|
|
Sound-reproducing mechanism
|
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US1803038A
|
|
Sound-reproducing mechanism
|
|
US1799322A
|
|
Sound-reproducing mechanism
|
|
US1735795A
|
|
Fruit grader
|
|
US1735796A
|
|
Grader
|
|
US1730532A
|
|
Acoustic transformer
|
|
US1730530A
|
|
Acoustic transformer
|
|
US1730529A
|
|
Sound-absorbent shield for walls of studios and the like
|
|
US1730531A
|
|
Acoustic transformer
|
|
US1730826A
|
|
Sound-translating chamber
|
|
US1708487A
|
|
Acoustic transformer
|
|
US1704840A
|
|
Acoustic transformer
|
|
US1672472A
|
|
Acoustic transformer
|
|
US1730528A
|
|
Acoustic transformer
|
|
US1677990A
|
|
Speedometer
|
|
US1431182A
|
|
Auxilliary brake for automobiles
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