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B.S.A.
From WikiPedalia
B.S.A. (Birmingham Small Arms) was a major British manufacturer of firearms, and later of bicycles and motorcycles. It reached its peak in the 1920's. The standard thread sizes that B. S. A developed for its bicycles were ultimately adopted as the standard British (B.S.C.) sizes, which, in turn, were mostly adopted by the I.S.O.
