Latécoère Laté 57 / Laté 570

Laté 570: [Project] 1932 4-engined flying boat, aka Laté 57-0 [?]
Laté 570: medium bomber to Nov 1934 B5, design begun 1937
Laté 570-01: 1939 prototype, 2 x 1120 hp HS.14Aa twin-row radials