(under subclass 3) Recorders of the type specified in ... in which one element of the recorder is responsive to pressure existing within the engine cylinder.
(1) Note. Many of the indicators in this subclass use a long traveling paper web, upon which a time graph is drawn as paper is reeled past recording stylus.
SEE OR SEARCH THIS CLASS, SUBCLASS:
72, for recorders having a marker responsive to the expansion of a chamber.
SEE OR SEARCH CLASS
73, Measuring and Testing, 700+, for fluid pressure gauges, particularly subclass 712 for recording type.
