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this is my link.8th century-
Oxen and horses for power, crude wooden plows, all sowing by hand, cultivating by hoe, hay and grain cutting with sickle, and threshing with flail -
this is my link (:1797-
Charles Newbold patents first cast-iron plow -
this is my link !!!!!!!!!!1837-
begin manufacturing steel plows; practical threshing machine patented -
1844-
Practical mowing machine patented -
1868-
Steam tractors are tried out -
1892-
The first gasoline tractor was built by John Froelich -
1910-15-
Big open-geared gas tractors introduced in areas of extensive farming -
1926-
successful light tractors developed
