Tsuneo Ito (no relationship to Yoji Ito) at Tokoku University developed an 8-split-anode magnetron that produced about 10 W at 10 cm (3 GHz). Based on its appearance, it was named Tachibana (or Mandarin, an orange citrus fruit). Tsuneo Ito joined the NTRI and continued his research on magnetrons in association with Yoji Ito. In 1937, they developed the technique of coupling adjacent segments (calling it push-pull), resulting in frequency stability, an extremely important magnetron breakthrough.Nakajima, S., "The history of Japanese radar development to 1945," Ch. 18 (pp. 243–258) in Russell Burns (ed.), Radar Development to 1945, Peter Peregrinus Ltd, 1988
