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active 1952, manufacturer of slide rules, Cardiff, Wales

Lewis & Tylor Limited

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

Unique Slide Rule Company Limited

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

Pickett

manufacturer of slide rules, American

Pickett and Eckel

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

Lawrence Engineering Service

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

A W Faber-Castell