What was the name of the submachine gun used during World War II, that was designed by Aimo Lahti?
Aimo Lahti: Aimo Johannes Lahti (April 28, 1896 – April 19, 1970) was a self-taught Finnish weapons designer. Aimo Lahti:  Of the 50 weapons he designed, the best known is the Suomi M-31 SMG.
i don't know