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DE3217736A1
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Table, especially for school pupils, with an adjustable table top for conversion into a music stand
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Insulated building air conditioning plant - has auxiliary heating system for water and air heating
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US4082722A
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Pre-mixed dental composition for the preparation of a dental silicate cement
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Hearing aid worn behind ear - has two sound inlets and two microphones in opposition
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Hearing aid with two sound inlets - large propagation time delay is produced for sound coming from front
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Hearing aid with directional microphones - has at least two microphones connected in series opposing in hearing spectacles
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Directional microphone system for hearing aids - has at least two spaced microphones on spectacles frame with opposite output voltages
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Hearing aid worn behind the ear - has two openings for sound and feed-back with rear microphone having delay of half wavelength
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Directional microphone unit for hearing aids - has two microphones connected in opposition to act as gradient microphone
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Improvements in methods of producing elastic impression compositions
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Process for the production of elastic impression materials
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Process for the production of provisional tooth locking materials
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