http://ppqs.gov.in/sites/default/files/sop_on_aerial_spraying_including_use_of_drones_1.pdf
Cost - 5 to 30lacs - DJI is also selling Drones for Spraying
http://www.thanos.in/products/, - also selling Drone Pilot License Course - only 5 days long - Rs.64900 - FY20 - 53lacs revenue and 72.43 lacs of expenses.
https://avianaerospace.com/, - incorporated in 2017 - last balance was in FY19 - no revenues worth talking about
https://www.aerialdrobotics.com/ - Age (Incorp. Date)0.5 Years (04-08-2021) - 3.5 lacs of authorised capital