True. Someplace I saw a picture of a B-36 next to a B-29 or B-50 and there is a large size difference between them. In the late 40's the B-47 was on the drawing board and it sent the piston types off to second line duties.

If you want to expand the production numbers then look up how many B-29/B-50's the USSR produced. I think they are called Tu-4 by Tupolev.

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