Final answer:
The mouldboard is a metal plow for digging ridges. The sickle is a curved blade used in agriculture. The thresher separates husk from grain.
Step-by-step explanation:
The mouldboard is a metal plow that could be used to dig deep ridges in an agricultural field. The sickle is a long, curved blade used in agriculture. The thresher is a device used in harvesting that separates the husk from the grain.
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