Editing APEXC (section)

==British Tabulating Machine Company machines==

[[File:Hollerith Electronic Computer1 Prototype.jpg|thumb|right|BTM Hollerith Electronic Computer 1 Prototype]]
In March 1951, the British Tabulating Machine Company (BTM) sent a team to Andrew Booth's workshop. They then used his design to create the Hollerith Electronic Computer 1 (HEC 1) before the end of 1951. The computer was a direct copy of Andrew Booth's circuits with extra Input/output interfaces. The HEC 2 was the HEC 1 with smarter metal casings and was built for the [[Business Efficiency Exhibition]] in 1953. A slightly modified version of the HEC 2 was then marketed as HEC2M and 8 were sold. The HEC2M was succeeded by the HEC4. Around 100 HEC4s were sold in the late 1950s.<ref name=bbk>{{cite web |url=http://www.dcs.bbk.ac.uk/50years/50yearsofcomputing.pdf |title=School of Computer Science & Information Systems A Short History  |date=2008 |website=Birkbeck, University of London |publisher=Department of Computer Science and Information Systems |access-date=2015-06-02 }}</ref>