4. Electric lamp and discharge devices
  5. With temperature modifier
  6. For lead-in-seal or stem protection

Rollei-Werke Franke & Heidecke GmbH & Co.

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Camera having an independently focused retractable objective len

Patent

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Optical imaging system having variable focal length

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent

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Reflector for varying illumination distribution

Illumination – Photographic lighting – Including specific light modifier
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Shutter speed display for viewfinder of a photographic camera

Electric lamp and discharge devices – With temperature modifier – For lead-in-seal or stem protection
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