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BASIC (Dartmouth) was perhaps the first language designed for time-sharing systems
PL/I was IBM's attempt to tie together concepts from FORTRAN, ALGOL, COBOL (and a little LISP) and to add more features; introduced concurrency and exceptions
Simula/67 that introduced objects and inheritance
Pascal (Wirth, 1971), a ALGOL-like language with a deep understanding of implementation issues
C (1972), designed in part for portable OS design