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Pagina principale
Brevetto
Brevetti Gran Bretagna 1893
- Patent:GB189307633 14.04.1893 Webb, Charles Henry (P) : Calculating apparatus
- Patent:GB189314364 16.09.1893 Watkins, Alfred (P) : Improvements in Instruments for Calculating Photographic Exposures
- Patent:GB189317656 11.11.1893 Wilson, Walter Gordon (P) : Improvements in Directors for Whitehead Torpedoes and the like