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manufacturer of slide rules, American

Pickett and Eckel

active 1952, manufacturer of slide rules, Cardiff, Wales

Lewis & Tylor Limited

active 1960s, manufacturer of slide rules, Chicago, United States

Pickett

active 1930s-1990s, manufacturer of slide rules, Newhaven, England

Unique Slide Rule Company Limited

active 1900-current (2007), maker of drawing instruments, slide rules & art supplies, Germany

A W Faber-Castell

active 1946, manufacturer of slide rules, Peru, Indiana, United States

Lawrence Engineering Service