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The milestones in C's development as a language are listed below:
- UNIX developed c. 1969 - DEC PDP-7 Assembly Language
- BCPL - a user friendly OS providing powerful development tools
developed from BCPL. Assembler tedious long and error prone.
- A new language ``B'' a second attempt. c. 1970.
- A totally new language ``C'' a successor to ``B''. c. 1971
- By 1973 UNIX OS almost totally written in ``C''.