(under the class definition) Apparatus having (1) signals, indicators, registers, recorders, or gauges for indicating a condition of the pump or pumped fluid or the position of a pump part such as a piston, control member, valve, etc., such devices comprising relatively movable, changeable or audible information giving parts, or (2) transparent viewing means whereby the 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 or a means whose sole purpose is to indicate a condition of the device. Relative to indicia there must be graduations or markings disclosed. Where it is indicated that the mere position of a pump part is indicative of a condition of the pump (e.g., valve handle position indicated direction of fluid flow) classification under the definition does not result unless some cooperating indicia are included.
