Unit record equipment

paper-based recording medium

electromechanical machine used to summarise information and perform accounting calculations

thumb|IBM 026 Keypunch|alt=thumb|Keypunch operators at work at the U.S. Social Security Administration in the 1940s right|thumb|Operators compiling hydrographic data for navigation charts on punch cards using the IBM Type 016 Electric Duplicating Key Punch, New Orleans, 1938

Norwegian engineer and informatician (1882–1925)

thumb|IBM 402 accounting machine control panel wiring. This board was labeled "profit & loss summary." thumb|Reverse side of the same 402 plugboard, showing the pins that make contact with the machine's internal wiring. The holes were called hubs. A plugboard or control panel (the term used depends on the application area) is an array of jacks or sockets (often called hubs) into which patch cords can be inserted to complete an electrical circuit. Control panels are sometimes used to direct the operation of unit record equipment, cipher machines, and early computers. The array of holes is often

electromechanical data processing machine