These are some of the manufacturers which made a notable contribution to calculator development:
APF[40] – US
Current manufacturers
Aristo[40] (Dennert & Pape) - Germany
Aurora – China
Bell Punch Company[40] and ANITA – UK
Bowmar[40] – US
Braun - Germany
Brunsviga[40] – Germany
Burroughs[40] – US
Busicom[40] – Japan
Canon[40] – Japan
Casio[40] – Japan
Commodore[40] (CBM) – Canada/US
Comptometer[40] and Felt & Tarrant – US
Compucorp[40] – US
Digitz – China
Elektronika[40] – USSR
Elite - Germany
Facit[40] – Sweden
Felt & Tarrant[40] – US →Comptometer
Friden, Inc.[40] – US
General Instrument[40] – US
Hewlett-Packard[40] (HP) – US
Hitachi[40] – Japan
IME[40] – Italy
Litronix[40] – US
Lloyd's[40] – US
MBO – Europe
Marchant[40] – US
Monroe[40] – US
National Semiconductor[40] – US
Nippon Calculating Machine[40] (NCM) – Japan →Busicom
Novus[40] – US →National Semiconductor
Odhner[40] – Russia and Sweden
Olivetti[40] – Italy
Quelle (de) Privileg (de) - Germany
Rapid Data[40] – Canada
Rockwell[40] – US
Sanyo[40] – Japan
Sharp[40] – Japan
Sinclair[40] – UK
Sumlock Anita[40] – UK →Bell Punch Company and ANITA
Summit[40] – US
TEAL[40] – Japan and US
Texas Instruments[40] (TI) – US
Toshiba[40] – Japan
Unicom[40] – US →Rockwell
Victor[40] – US
Wang[40] – US
Aurora Office Equipment Company (China)
Canon Inc. (Japan)
Casio Computer Co., Ltd. (Japan)
Citizen Systems Japan Co., Ltd. (Japan)
Hewlett-Packard Development Company, L.P. (US)
Kinpo Electronics, Inc. (Taiwan)
Sharp Corporation (Japan)
SwissMicros GmbH (Switzerland)
Texas Instruments Inc. (US)
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