| http://www.w3.org/ns/prov#value | - The force for pressing the rotary tool into the boundary varies in accordance with a kind of the elements 7, a thickness of the elements 7, an outer shape of the rotary tool 1, a rotational velocity of the rotary tool 1, a proceeding velocity of the rotary tool 1 along the elements 7 and so forth, and particularly increases in accordance with an increase of the thickness of the elements 7.
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