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Railway slide rule

1928

Railway slide rules

1928

Railway slide rule

1928

Railway slide rules

1928

Railway slide rules

1928

Railway slide rule

1928

Railway slide rule

1928

Railway slide rule

1928

Railway slide rule

1928
Selection of nine railway slide rules, English, three signed "P.H.J. 1928", eight paper on wood with brass fittings and one ivorine on wood

Selection of nine railway slide rules

1928