(under the class definition) Apparatus having (1) signals, indicators, registers, recorders or gauges for indicating either a condition of operation of the device or the condition or position of a part thereof or (2) window means whereby the operation of the device or the condition or
position of a part thereof may be readily observed.
(1) Note. For classification under part (1) of this definition there must be either an indicia or an audible or visible 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 part is indicative of a condition of the device (e.g., valve handle position corresponds to direction of working member rotation or position of a part of the device) 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 References to Other Classes in the class definition of this class for a general statement of the line between this class and Class 73.
91, Motors: Expansible Chamber Type, 1, for signals, indicators or inspection means for expansible chamber type motors.
92, Expansible Chamber Devices,
5, for signals, indicators or inspection windows for expansible chamber devices.
