SLIDE RULE - RÉGUA DE CÁLCULO.
Slide Rule - Proportion, Percentage, Squares And Square Roots - 1944.
20 min. 17 sec.
SLIDE RULE - RÉGUA DE CÁLCULO.
Slide Rule vs Calculator Showdown: Decilon & HP-35.
14 min, 03 sec.
Research source: A/V Geeks and Prof. Herning.
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