1.) using force, who is the main method used since ancient times and used it until now. Tools used: hoe hoe hoe-tooth a shovel digging, thak, etc. These tools are often used to prepare the ground for small areas such as kitchen gardens behind the House or garden plants as a Lum farm. There is no more than 5 acres of space per family, etc. 2.) using primarily as a way to force the animal to human use, since the former, and is also popular in many countries, the main occupation is farming. Tools used: the pig head, County Grooved lifting tool rake na black etc. These tools are used to force their animals. Cattle or horses, as the towing assist human workload, work. 3) using the engine as a way to force human development presents the car as the beginning of a strong man and animal are substitutes. There are many projects drag. Various devices can be installed to the master are viable projects drag causes the continuous long widely. Can be prepared in large areas quickly? The engine used is several sizes and space activities in land preparation and planting started relevant until harvest.
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