Significance

Manual adding machines were used in the 20th century for mainly book-keeping and other office purposes until superseded by calculators in the 1970s and the personal computer from the late 1980s.

Physical description

Contex calculating machine. Light and dark grey.

Inscriptions & markings

On front: 'Contex. Made in Denmark.'
On bottom: 'TT0809 Instructions for lubrication.'
Handwritten: 'Chris Couper 722-1647'