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Die große Enzyklopädie des mechanischen Rechnens

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Search results for: Watkins, Alfred


 
  • Patent:GB189314364 16.09.1893 Watkins, Alfred (P) : Improvements in Instruments for Calculating Photographic Exposures
  • Patent:GB189425000 02.05.1889 Watkins, Alfred (P) : Improvements in Instruments for Calculating Photographic Exposures
  • Patent:GB190227822 05.02.1903 Watkins, Alfred (P) : Improvements in Instruments for Calculating Photographic Exposures
  • Patent:US456869 28.07.1891 Watkins, Alfred (P) : Instrument for calculating photographic exposures

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