|
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Improvements in or relating to electromagnetic vibratory devices
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Improvements in or relating to electro-magnetic vibratory devices such for example as loudspeakers
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Improvements in or relating to electro-magnetic vibratory devices
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GB346852A
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Improvements in electro-magnetic vibratory devices, such for example as sound reproducing or recording devices
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US1822465A
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Electrical vibratory device such, for example, as a loud speaker
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GB328450A
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Improvements in or relating to electromagnetic devices for use, for example, in recording or reproducing sounds
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GB332238A
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Improvements in or relating to electro-magnetic vibratory devices, such for example as loudspeakers
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|
GB322663A
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Means for securing improved needle track alignment in disc talking machines
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ES110252A1
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Perfection in electrically operated vibratory devices, used in the reproduction and transmission of sounds.
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GB321327A
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Improvements in and relating to electro-magnetic vibratory devices for acoustical instruments
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Electromechanical vibration-translating device such for example as loud-speakers
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ES106355A1
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Perfection in vibratory devices powered by electricity, such as those intended for the transmission reproduction or recording of sound.
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|
GB305429A
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Improvements in or relating to electrically operated vibratory devices such as are used in the recording or reproduction of sounds
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|
US1699903A
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Loud-speaker
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CA315762A
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Electro-magnetic vibratory device
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CA307985A
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Electrical vibratory device
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|
CA290217A
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Electrically operated vibratory device
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