COPRA came into action on:
15th April 1987
15th April 1989
25th April 1988
15th April 1986
CONSUMER PROTECTION ACT
(CPA/COPRA) 
The Consumer Protection Act, 1986 that came into force on 15th April, 1987 is a milestone in the history of socio-economic legislation in the country. It is one of the most progressive and comprehensive pieces of legislation enacted.
Essentials of preventive and community dentistry
Soben Peter
5th edition