Symbol 1574 from ISO 7000 - Title/Meaning: Threshing cylinder Function/description: To identify the control for the threshing cylinder of the combine harvester. To indicate the operational status of the threshing cylinder.
Additional information: 
The symbol may be used with a numerical indicator of threshing cylinder rotational speed.
Own work using: iso.org/obp/graphics/grs/8a7c68d4-cae5-42ad-89c0-1ecf53c8ce85 200.png
Vectorization:  Mrmw