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Hearing aid tone control

G - Physics – 02 – C
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Hearing aid transistor amplifiers

G - Physics – 02 – C
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Hearing aid volume control

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Hearing aid with frequency-selective agc

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Hearing aids

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Hearing aids

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Hearing aids

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Hearing aids

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Hearing aids of the type incorporated in spectacles

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Hearing-aid

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Hearing-aid

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Hearing-aid device

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Heating and heat preserving device for contact lens

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High performance selective light wavelength filtering...

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High strength ophthalmic lens

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High-order aberration correction for optimization of human...

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Highly oxygen permeable contact lens materials and...

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Hinge between a side piece and an endpiece of glasses

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Hinge device, particularly for spectacle frames

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Hinge for eyeglasses

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