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1961-1995, manufacturer of chemicals, aerospace equipment and electronic equipment, Bethesda, United States

Martin Marietta Corporation

1961 - 1995
1875-1961, manufacturer of electronic equipment, London

A C Cossor Limited

1859 - 1961
1992-2011, smartphone manufacturer, United States

Palm Incorporated

1992 - 2011
1931-current (2022), manufacturer of electronic equipment, London, England

Multitone Electronic Company Limited

1931
active 1960s-current (2012), manufacturer of electronic equipment, Copenhagen, Denmark

Brüel & Kjær (Sound and Vibration Measurement) A/S

1942
active about 1960-?, manufacturer of electronic equipment, Southend-on-Sea, England

Ekco Electronics Limited

active 1896-1900?, manufacturer of electronic equipment, England

Cossor and Watson Limited

1980-current (2013), electronics manufacturer, United Kingdom

Psion

active c. 1965-1979?, manufacturer of electronic equipment

Digitron Instrumentation Limited