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Peterlee Relational Test Vehicle
The "Peterlee Relational Test Vehicle" (PRTV) was an experimental relational DBMS developed at
the IBM UK Scientific Centre in Peterlee County Durham, England starting in 1970 and completing in 1978.
PRTV was designed to be a query oriented database subsystem. Since its development predates SQL, it used it's own language called Information System Base Language (ISBL).