any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks

a farm implement used to break up the surface of the soil (for aeration and weed control and conservation of moisture)

farm machine that gathers a food crop from the fields

a farm machine that treats hay to cause more rapid and even drying

a farm machine for separating seeds or grain from the husks and straw

an agricultural rake used to collect cut hay or straw into windrows for later collection.