This patent held by Kharkov Velocipyed Zavod covers their classic steel derailleur, with their signature design featuring both adjustment screws on the front knuckle - see Kharkov (2nd style) and Kharkov (3rd style). Usefully, it demonstrates that this design dates from 1975.

• Publisher: Rospatent
• Inventor: Philip Aleksandrovich Priboloi & Vassily Maksimovich Majboroda
• Country: Russia
• Date: USSR application filed April 1975
• Derailleur brands: Kharkov
• Derailleurs: Kharkov (2nd style), Kharkov (3rd style)