supply and buy back of electrically operated scrubber and drier machine and supply of heavy duty wet n dry vacuum cleaner supply and buy back of electrically operated scrubber and drier machine and supply of heavy duty wet n dry vacuum cleaner , electrical operated walk behind scrubber anddrier machine , supply, installation, testing and commissioning of 6 nos of electrical operated walk behind scrubber anddrier machine , buybackof6 nos of electrical operated walk behindscrubber anddrier machine (total amount of buy back machine will be deducted from total amount of new electrical operatedwalk behind scrubber anddrier machine)