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What are the contributions to labourers by B.R. Ambetkar?

Dr. BR Ambedkar worked extensively to provide for better labor laws. For example,

1. He asked to reduce the factory working day to 8 hours.

2. He asked for the recognition of Trade Unions.

3. He worked towards developing an Employee State Insurance

4. He instituted the idea of minimum wage for the worker

5. He opened the Coal and Mica Mines Provident Fund.