A Ripper is an attachment used on Crawler tractors, Tracked Shovels or Tractors that hass one or more "shanks" with a hardened steel tooth or bit on the end that id drawn into the ground and "Rips it up".
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add details of different types
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The big names sell them under there own brand, but 3rd parties also make then (in some cases for the big brands). A lot of Agricultural machinery manufactures built a type of ripper called as sub-soiler for use with tractors, as part of their Implements line.
