Société des Avions René Couzinet established 1926 to build (in Letord factory) 3-engined monoplane Arc en Ciel (rainbow) to fly N. Atlantic. Couzinet 10 destroyed, but led to improved Couzinet 30 and thus to second Arc Couzinet 70, flown across S. Atlantic by Mermoz 1933. Single examples also of 3-seat Couzinet 101 (3 x 85-hp) and 4-seat 110 (3 x 135-hp).

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