question: The Cierva C.8 was built by Juan de la Cierva in association with a company founded in what year?
answer: 1910
context: Title: Cierva C.8
  Passage: The Cierva C.8 was an experimental autogyro built by Juan de la Cierva in England in 1926 in association with Avro.  Like Cierva's earlier autogyros, the C.8s were based on existing fixed-wing aircraft fuselages – in this case, the Avro 552.
  Title: Cierva C.3
  Passage: The Cierva C.3 was an experimental autogyro built by Juan de la Cierva in Spain in 1921.  It was based on the fuselage of a Sommer monoplane, and was actually completed and tested before that aircraft.  The C.3 utilised a single, three-bladed rotor in place of the coaxial double rotor tested on the C.1.  A few short hops were achieved in testing and Cierva noted a tendency for the machine to want to roll over, thus alerting him to the problem of dissymmetry of lift that he would have to overcome in order to build a successful rotary-wing aircraft.  The C.3 was damaged and rebuilt four times before being abandoned without having flown, la Cierva returning to work on the C.2.
  Title: Cierva C.2
  Passage: The Cierva C.2 was an experimental autogyro built by Juan de la Cierva in Spain in 1921-22.  Following the failure of the C.1 the previous year, la Cierva started again from scratch, this time taking the fuselage from a Hanriot biplane and adding a five-bladed single rotor to it.  Work was interrupted when Cierva ran out of funds, and the machine was not actually completed until 1922, after his next design, the C.3 had already been built and tested.  Attempts to fly the aircraft resulted in repeated crashes, and the machine was rebuilt nine times before being finally abandoned.
  Title: Avro
  Passage: Avro was a British aircraft manufacturer founded in 1910 whose designs include the Avro 504 used as a trainer in the First World War, the Avro Lancaster, one of the pre-eminent bombers of the Second World War, and the delta wing Avro Vulcan, a stalwart of the Cold War.
citations: Avro Cierva C.8