12/31/2013. Remarks by Kees Kort: "The Farman HF.1, dating from the beginning of 1909, was actually the first design of Henri Farman (hence the HF) which was a further development of the classic pusher biplanes of the Voisin brothers. Note that Henri and Maurice Farman (MF) were brothers but had different factories with different design basics. There was till 1915 no interaction between the two factories, after that the two firms amalgamated in the Farman factory."