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GB723221A
|
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Improvements relating to electric deaf aid apparatus
|
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GB618468A
|
|
Improvements in combs for the hair
|
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GB498468A
|
|
Improved method of and apparatus for the transmission of speech and other sounds
|
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GB416436A
|
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Improvements in apparatus for reproducing and/or recording sounds
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GB381540A
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Improvements in low frequency transformers
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GB349630A
|
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Improvements in loud speakers and other telephone receviers
|
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GB314128A
|
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Improvements in audio-frequency transformers for wired and wireless telephony
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