Photo by Dore (attr. E. K. Popova), Moscow, Russia, 1909 (based on autograph) 7.2 х 11.4 cm Autographed on back: To Konstantin Turchanimov, patience, diligence, and conscientiousness will help overcome everything. Pav. Fedorov. 30.V.1909 Pavel Fedorovich FEDOROV, a mechanical engineer by profession, taught at the Imperial Komissarov Technical School in Moscow and was member of the Society for Technical Education. FEDOROV, P. F. (Федоров П.Ф.)