Societatea Pentru Exploatări Technice formed Bucharest 1923, creating as manufacturing subsidiary Fabrica de Avioane to build aircraft to government order to designs of Grigore C. Zamfirescu. All single-engined biplanes, for training, observation and (SET XV, 1934) fighting. Designing ceased 1937 but in 1941-2 built 30 He 111H-3.