4. Radiant energy
  5. Photocells; circuits and apparatus
  6. Photocell controlled circuit

Wilfried Holtje

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Automatic electronic flash device

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent

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Electronic flash unit

Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent

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Profile ID: LFUS-PAI-P-1378301

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