Ishikawajima Kokuki KK formed at Tokyo December 1924, with factory at Tachikawa. Built small batches of 2-seat biplanes: T-2/-3 recon, R-1/-2/-3/-5 trainers and light ambulance (later designated KKY). KKY with 130-hp Cirrus replaced by 150-hp Ha-12 or Kamikaze radial was developed as KS-1 for survey duty while company was being reorganized 1936 as Tachikawa.

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