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French patent for improvements to telescope and photographic lenses. No 217186

French patent for improvements to photographic lenses. Granted to Hugh Lancelot Aldis. No 254377

French patent for improvements to photographic lenses. Granted to Thomas Rudolphus Dallmeyer No 295212

French patent for improvements to prismatic binoculars. Granted to Thomas Rudolphus Dallmeyer. No 314397

French certificates of renewal of: 'ADON' and 'JH Dallmeyer, London' trademarks. Nos 13455 & 13456