4. Optical: systems and elements
  5. Absorption filter
  6. Movable in or out of optical path

Arthur Hewett

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Apparatus for positioning apertures of a disk assembly

Optical: systems and elements – Absorption filter – Movable in or out of optical path
Patent

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Light fixture with elliptical reflector and mechanical shutter d

Illumination – Light modifier – Adjustable or positionable
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Profile ID: LFUS-PAI-P-1367041

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