(under subclass 154) Dispensers in which pipes or conduits are provided with transparent sections so that the fact of flow or the presence of material may be determined.
SEE OR SEARCH THIS CLASS, SUBCLASS:
40, for transparent flow line sections having an indicator moved by flowing material or for moving indicators exterior to the flow line section.
SEE OR SEARCH CLASS
116, Signals and Indicators,
264+,.
184, Lubrication, 96+,.
406, Conveyors: Fluid Current,
36,.
431, Combustion,
13, for a burner having a transparent viewing area.
