LC control no. | n 97117579 |
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Personal name heading | Beckman, Bengt |
Found in | Svenska kryptobedrifter, c1996: t.p. (Bengt Beckman) Codebreakers, c2002: CIP t.p. (Bengt Beckman) data sheet (Beckman, Bengt A.T., Sept. 30, 1925) |