| http://www.w3.org/ns/prov#value | - A process for selectively dissolving solid and semi-solid materials, comprising producing ultrasonic-frequency energy of the order of at least 90- 100 Mhz, propagating such energy as a radiated acoustic wave from a predetermined region and upon material-to-be dissolved at a juxtaposed region to subject the material to the radiated acoustic wave energy and thereby dissolve the material locally into
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