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A comment on The Cannons on the B-29 Bomber. Parent comment

Re:The Cannons on the B-29 Bomber by mikeash on Wednesday December 02, 2015 @11:35AM (#10663919)
Doesn't (A) count the cost of producing all 3,970 airplanes, not just the R&D cost? Seems a bit misleading to compare that to an R&D program that produced one test device and two bombs.
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