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Sliding scale for determining BBC radio frequencies

Slide rule

1949

AEG Elfa-Rechner

1965-1975

Circular ready reckoner calculator for gauging electrical cables by Smith (Calculators) Limited

1961-1965

Plastic ready reckoner

1965-1980
Circular slide rule and radio transmission line calculator (Smith chart), plastic, in cardboard folder with circular scale

Circular slide rule and radio transmission line calculator (Smith chart)