- TitleFrench patent for improvements to photographic lenses. Granted to Hugh Lancelot Aldis. No 254377
- Reference198028/2/5
- Date1898
- CreatorJH Dallmeyer Ltd
- Scope and ContentWith diagram, specification and covering letter
- LanguageEnglish
- Persons keywordHugh Lancelot company secretary JH Dallmeyer Ltd Aldis
- SubjectFrance