This is a machine used to spray pesticides, etc. Power Cylinder are basically used to open and close the boom, but they are also used to raise and lower the boom itself.
In addition to electric types, there are also hydraulic types, but electric types are preferred due to issues such as the hassle of piping.
The boom opens when spraying pesticides, etc., and when the work is finished, the boom is closed and the vehicle is driven away.