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Transistor amplifier
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Acoustical device
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DE1184378B
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Board for displaying visible images with the help of electronic elements
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Acoustic apparatus
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Electrical apparatus
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Acoustical device
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Display panel comprised of a plurality of magnetically-controlled, movable, light reflecting, thin panels
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Acoustical apparatus
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Acoustical device
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Acoustical device
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Improvements in or relating to temple constructions for spectacles
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Acoustical instruments
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Snap coupling between eyeglass temple plate and hearing aid housing
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A temple member for a pair of spectacles
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Magnetic field sensing device
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Apparatus for and method of identifying material units
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Temple construction
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Temple-mounted hearing aid control
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Feed rate meters
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Microphone mounting for hearing aids
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