(under the class definition) Barometers, i.e., devices for determining atmospheric pressure whether calibrated in units of barometric pressure or altitude.
(1) Note. Altimeters (other than the barometric type) are classified in other classes in accordance with the means employed to make the distance measurement, see the notes below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
700+, for other pressure gauges, and see the notes thereto.
SEE OR SEARCH CLASS
33, Geometrical Instruments. 181, Acoustics,
124, for mechanical sound echo altimeters.
367, Communications, Electrical: Acoustic Wave Systems and Devices,
