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

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

1961-1965
Plastic ready reckoner

Plastic ready reckoner

1965-1980
Sliding scale for determining BBC radio frequencies

Sliding scale for determining BBC radio frequencies

AEG Elfa-Rechner

AEG Elfa-Rechner

1965-1975
Slide rule

Slide rule

1949
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)