7 basic types of airplane engines not governmentally approved to date; in each instance, however, engine is awaiting approval pending completion of tests, etc.
Aircraft engines -- Without approved type certificates
Aero Digest
Aero Digest ; 32 , n 3
1938
Article (Journal)
English
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Aircraft engines -- Without approved type certificates
Engineering Index Backfile | 1939
Aircraft engines -- Without approved type certificates
Engineering Index Backfile | 1940
Aircraft engines -- Without approved type certificates
Engineering Index Backfile | 1938
Aircraft engines -- Manufactured under approved type certificates
Engineering Index Backfile | 1938
Aircraft engines -- Manufactured under approved type certificates
Engineering Index Backfile | 1938