New Delhi, July 15 -- Manufacturer of diesel engines, generators and pump sets, Greaves Cotton has increased its stake in Coimbatore-based electric vehicle (EV) manufacturer Ampere Vehicles from 67.34% to 81.23% by investing an additional amount of Rs.38.49 crore. The said amount is invested in acquiring 25,73,529 equity shares of Ampere Vehicles through primary and secondary purchase....