The ARRA (for “Automatische Relais Rekenmachine Amsterdam”, Automatic Relay Calculator Amsterdam) was the first Dutch computer, and was built from relays for the Dutch Mathematical Centre (Dutch: Mathematisch Centrum), which later became the Centrum Wiskunde & Informatica (CWI).
(From wikipedia: https://en.wikipedia.org/wiki/ARRA_(computer) )
1953 “Functionele beschrijving van de arra”
Edsger W. Dijkstra:
(Before this: Electrologica X1 Computer )
To Prof Dr Adriaan. van Wijngaarden:
Remembering ARRA: A pioneer in Dutch computing (English)