Difference between revisions of "Patent for Perfectionnements apportés aux dispositifs servant à l'éclairage, Geyling, Planer, 1930 (Q38423)"

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Patent for Improvements to lighting devices

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Revision as of 21:15, 13 February 2025

Patent for Improvements to lighting devices
  • FR674233A
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English
Patent for Perfectionnements apportés aux dispositifs servant à l'éclairage, Geyling, Planer, 1930
Patent for Improvements to lighting devices
  • FR674233A

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