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GB635868A
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Improvements in or relating to gramophone records
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GB623695A
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Improvements in or relating to electric dry cells
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GB625660A
|
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Improvements in or relating to sound recording or broadcasting studios
|
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GB592192A
|
|
Improvements in world time-indicators
|
|
GB540802A
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Improvements in or relating to ventilating and air conditioning systems
|
|
GB494935A
|
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Improvements in or relating to sound-proof ventilating windows
|
|
GB499693A
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Improvements relating to the construction of walls and partitions in building structures
|
|
GB490876A
|
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Improvements in and relating to sound excluding ventilating windows
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|
GB490796A
|
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Improvements in and relating to sound absorbing ventilating casement windows
|
|
GB497711A
|
|
Improved means of and apparatus for promoting the circulation of air currents for ventilation or cooling purposes
|
|
GB484045A
|
|
Improvements in sound suppressing ventilating windows for vehicles
|
|
GB462918A
|
|
Improvements in sound excluding ventilating windows
|
|
GB461706A
|
|
Improvements in and relating to sound absorbing partitions, walls and the like
|
|
GB423616A
|
|
Improved apparatus for the conditioning of air in living rooms, offices, vehicles and the like
|
|
GB367764A
|
|
Improvements in sound reducing screens for windows and other wall apertures
|
|
GB357661A
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Improvements in pivotal sash windows
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|
GB321424A
|
|
Improved ventilator
|
|
GB321408A
|
|
Improved sound-suppressing ventilating fitting for windows
|
|
GB241349A
|
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Sound screening attachment for windows and like wall apertures
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GB220297A
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Improved method and apparatus for generating, relaying, rectifying, transforming and amplifying alternating or pulsating currents
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