In the early 20th century, desktop adding machines and other calculating devices were developed. Adding machines were widely used in offices until they were phased out in favor of calculators from the 1970s and then personal computers from the late1980s.Refer to Life and Career of Jorgen S Lien attached separatelyAdwel Adding Machine - a full keyboard printing calculator. Able to add, subtract and subtotal. Manual operation. 1960. Made by Jorgen S. Lien.On top: 'Adwel'. Also a sticker: 'Sales and Service / Melbourne Typewriter Co. Pty. Ltd. / 363 Clarendon St., Sth. Melb.' On side: 'Made by Jorgen S. Lien, Bergen, Norway'commerce, emerald, victoria, australia, jorgen s lien, adding machine