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Keystone Aircraft Corp LB-11

A number of the Keystone aircraft became one-off flying testbeds for various newly developed geared or direct-drive versions of the Hornet and Cyclone engines. This programme gave rise to the new designations LB-8, LB-9, LB-10, LB-11, LB-11A and LB-12. Most of these were conversions from existing LB-6 or LB-7 bombers.

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