[1] Barrón was posted to the Compañía de Aeroestación y Alumbrado en Campaña aerostat section in 1908 under Colonel Vives, becoming a certified balloon pilot in July 1909.

[2] In 1911 Barrón was transferred back to peninsular Spain where he was selected to become an aircraft pilot, together with pioneering Spanish military airmen Alfredo Kindelán, Emilio Herrera, Enrique Arrillaga and José Ortiz Echagüe.

[4] The Loring Pujol y Cia company in Barcelona was commissioned with building twelve units of the Barrón España, but these never entered active service owing to serious construction flaws.

[8] However, the stock of cheap and more technologically advanced World War I planes available at the end of the conflict foreclosed any incentive for the development of a local aircraft industry for the time being.

[2] Barrón returned to Cuatro Vientos in order to become chief engineer at a newly built aeronautical factory, Talleres Loring, which had won a contract to produce Fokker C.IV reconnaissance planes under licence.

Thanks to this support, Barrón's following project, the Loring R.I reconnaissance and light bomber, went into production and thirty units were built for the Aeronáutica Militar of the Spanish Army.

Based on this plane he designed and developed the Loring R-III, an aircraft of similar characteristics powered by a Hispano-Suiza 12Hb, which went into production with a total of 110 units built.

A modified E.II, named La Pepa and fitted with a Kinner K-5 motor, would be used by Fernando Rein Loring (1902-1978) in his solo flight from Madrid to Manila in 1932.