4. Optical: systems and elements
  5. Light control by opaque element or medium movable in or...
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Variable aperture

Optical: systems and elements – Light control by opaque element or medium movable in or... – Fluid
Reexamination Certificate

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Variable opacity or translucency of a through-vision panel

Optical: systems and elements – Light control by opaque element or medium movable in or...
Reexamination Certificate

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Variable shutter illumination system for microscope

Optical: systems and elements – Light control by opaque element or medium movable in or...
Patent

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Variable slit width device for spectroscope

Optical: systems and elements – Light control by opaque element or medium movable in or... – Slit type
Reexamination Certificate

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Variable width optical slit mechanism

Optical: systems and elements – Light control by opaque element or medium movable in or... – Slit type
Reexamination Certificate

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Variable-apex prism controller

Optical: systems and elements – Light control by opaque element or medium movable in or... – With rotating or pivoting element
Patent

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