generate questions: The British had already arranged licence building of the Bofors 40 mm, and introduced these into service. These had the power to knock down aircraft of any size, yet were light enough to be mobile and easily swung. The gun became so important to the British war effort that they even produced a movie, The Gun, that encouraged workers on the assembly line to work harder. The Imperial measurement production drawings the British had developed were supplied to the Americans who produced their own (unlicensed) copy of the 40 mm at the start of the war, moving to licensed production in mid-1941.
What did the British get a license to build? {sep_token} While light, the Bofors 40mm were powerful enough to take down what size aircraft? {sep_token} What was produced to inspire people on the assembly line to work harder? {sep_token} What was the movie made to inspire assembly line workers called? {sep_token} Who started making an unlicensed version of the 40mm at the beginning of the war?