| http://www.w3.org/ns/prov#value | - roductory section of document (7), it is explained that tractor fluids have specific characteristics which provide for their ability to operate within tractor equipment, and that they must in general act as a lubricant, a power transfer means and a heat transfer means, and must pass a variety of different types of tests (see column 1, lines 13 to 57).The invention is then summarised as relating to
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