(under subclass 78.5) Apparatus in which a fluid flow is controlled in response to variations of atmospheric pressure.
(1) Note. See (1) Note and (2) Note to the definition of subclass 78.1.
SEE OR SEARCH THIS CLASS, SUBCLASS:
455+, for valves controlled by changes in line pressure, especially subclass 482 for suction compensators for combustion engine induction type line conduction change responsive valves.
SEE OR SEARCH CLASS
454, Ventilation,
70+, 238, 255, and 340 for apparatus for maintaining a pressure in enclosure including means responsive to air conditions either in the atmosphere or in the enclosure.
