and was released in 1987 as 4th Dimension and known today as 4D.

The first systems that were relatively faithful implementations of the relational model were from:

* University of Michigan - Micro DBMS (1969)
* Massachusetts Institute of Technology (1971)
* IBM UK Scientific Centre at Peterlee - IS1 (1970-72), and its successor, PRTV (1973-79).

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