Frederick James Hargreaves
Frederick James Hargreaves was an aero inventor addressed at 17 Upton Avenue, Forest Gate, London, E, on whom we have minimal information. He is likely the inventor whom we have some entries, in the 1890s, designated merely under the name Hargreaves.
Patents whose inventor or applicant is Frederick James Hargreaves
- Patent GB-1909-8432 (English title: Apparatus for Automatically Balancing Aerial Machines and the like, Filing date: 1909-04-07)
- Patent FR-1910-415524 (English title: Improved balance apparatus for aerial and other machines, Filing date: 1910-05-04)