(under subclass 445) Subject matter in which the sensing means is responsive to the pressure in, (1) a fluid medium (i.e., gaseous or a liquid medium) or (2) a granular medium (i.e., a mass of particulate material or of discrete particles, such as, for example, sand, wheat, grains, shot, etc.).
SEE OR SEARCH THIS CLASS, SUBCLASS:
482, and the subclasses specified in the notes thereto, for motor systems having the automatic control of an electric motor in response to the level of a fluid or of a granular material.
