| http://www.w3.org/ns/prov#value | - Steam engine development effectively ground to a halt in the nineteenth century, although there were a very few significant developments in the first half of the twentieth century, yet Ingeniero Livio Dante Porta (see for example: http://www.portatreatment.com/porta/ldp-biog-css.htm ) and his disciples (e.g. David Whardle) have shown that steam still offers great potential, and not from romantic a
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