(under subclass 325) Apparatus having (1) signals, indicator, registers, recorders, or gauges for indicating a condition or the position of a motor or pump part such as a piston, control member, valve etc., such devices consisting of a relatively movable, changeable or audible information giving parts, or (2) transparent viewing means whereby the motor or pump operation or the condition of some part thereof may be observed.
(1) Note. For classification under part (1) of this definition there must be either an indicia or an audible or visual signal. Relative to indicia, there must be graduation or markings in the disclosure as claimed. Where it is indicated that the mere position of a motor part is indicative of a condition of the motor (e.g., valve handle position corresponds to motor or pump position) classification under this definition does not result unless some cooperating indicia are included.
SEE OR SEARCH CLASS
73, Measuring and Testing,
232+, for expansible chamber type volume or rate of flow meters and see Lines With Other Classes of the class definition of Class 91, Motors: Expansible Chamber Type, for a general statement of the line between Class 91 and Class 73.
91, Motors: Expansible Chamber Type,
1, for fluid motors, signals and indicators, and see Search Class 73 note above.
92, Expansible Chamber Devices,
5, for signals, indicators or inspection windows for expansible chamber devices.
340, Communications: Electrical,
500+, for electrical automatic condition responsive indicating systems.