Burroughs Class 4 1000 hand operated adding and listing machine with keyboard for Sterling currency 1925-1935
Sheet giving an example of work performed on Burroughs class 11 machine at H.M. Nautical Almanac Office, Greenwich Sheet giving an example of work performed on Burroughs class 11 machine at H.M. Nautical Almanac Office 1929
Brunsviga manual calculator model B 13RM ser.no.16459 by Olympia Werke AG, Wilhelmshaven but made in Spain. Brunsviga manual calculator model B 13RM ser.no.16459 by Olympia Werke AG 1965-1975
Monromatic model electric calculating machine by Monroe Calculating Machine Company Inc., IQ 213 Serial No. 493640 Monromatic model electric calculating machine by Monroe Calculating Machine Company Inc. 1960-1965
Electromechanical calculating machine by Heinrich Diehl GmbH, Nuremberg, model EVM 18, " Archimedes Lizenz", serial no. 18851 Electromechanical calculating machine by Heinrich Diehl GmbH 1955-1965
Lagomarsino-Numeria manual calculating machine, model 5903, serial no. 072327; made in Italy Lagomarsino-Numeria manual calculating machine 1960-1970
Boots Ring Plan Standard 5-inch slide rule with plastic sleeve and instructions Boots Ring Plan Standard 5-inch slide rule 1970-1980