The Junkers J 21 (manufacturer's sales designations T 21 and H 21) was a reconnaissance aircraft designed in Germany in the early 1920s and produced in the Soviet Union at the Junkers plant at Fili for use by the Soviet Air Force.
* Junkers T 21, a manufacturer designation for the 1923 German
Junkers Ju-21 reconnaissance aircraft
* SJ T21, a 1950s Swedish diesel-hydraulic locomotive
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