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2. Method and apparatus for measuring or monitoring density or rheological properties of liquids or slurries;Dann,1987
3. Method and apparatus for analyzing the composition of an electro-deposition coating material and method and apparatus for controlling said composition;Kikuta,1994
4. Method and apparatus for determining the particle size distribution, the solids content and the solute concentration of a suspension of solids in a solution bearing a solute;Sowerby,1996
5. Ultrasonic studies;Sette,1968