Linked from
The 9 pages that link to Combine harvester, each with the reason it gives.
Agricultural machineryBroader topic: It combines several harvest stages into a single machine pass.
HarvestBroader topic: It combines several grain-harvesting steps in one pass.
StrawRelated: A combine typically separates grain while leaving or distributing straw behind.
ThreshingBroader topic: Its threshing system works as part of a continuous harvesting process.
SwatherRelated: After a swather lays grain in windrows, a combine can pick them up and thresh them.