4. Optics: image projectors
  5. Plural projection paths with single light source

Clayton H. Allen

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Apparatus for alloying of coatings

Coating apparatus – With heat exchange – drying – or non-coating gas or vapor... – To remove or spread applied coating by gas blast
Patent

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Kaleidoscope

Optics: image projectors – Plural projection paths with single light source
Patent

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Means for stabilizing sound pressure produced at the eardrum und

Electrical audio signal processing systems and devices – Hearing protectors – electrical
Patent

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Noise suppression

Machine element or mechanism – Elements – Cams
Patent

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Nonlinear passive acoustic filtering

Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent

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