Editing Unit record equipment (section)

==Tabulating==
{{main| Tabulating machine}}
[[File:Ibm407 tabulator 1961 01.redstone.jpg|thumb|An IBM 407 [[tabulating machine|Accounting Machine]] at US Army's Redstone Arsenal in 1961.]]
Reports and summary data were generated by accounting or [[tabulating machine]]s. The original tabulators only counted the presence of a hole at a location on a card. Simple logic, like ands and ors could be done using relays.

Later tabulators, such as those in [[Tabulating machine|IBM's 300 series]], directed by a [[plugboard|control panel]], could do both addition and subtraction of selected fields to one or more counters and print each card on its own line. At some signal, say a following card with a different customer number, totals could be printed for the just completed customer number.  Tabulators became complex: the IBM 405 contained 55,000 parts (2,400 different) and 75 miles of wire; a Remington Rand machine circa 1941 contained 40,000 parts.<ref name=RR1941/><ref>{{cite book |last1=Cambell-Kelly |first1= Martin|last2=Aspray| first2=William |title= Computer: a history of the information machine|edition=2 |publisher= Basic Books |year= 2004 |page = 42}}</ref>  
<!---In Europe, the IBM 421<ref>http://yves.cornil.free.fr/tabul.htm "Les tabulatrices 421 IBM", Retrieved 2006-10-09</ref> tended to be used for tabulating. This belong in 407 article, not here.agr --->