US PATENT SUBCLASS 33 / 122
.~ Planimeters

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

121  DF  AREA INTEGRATORS {3}
122.~ Planimeters

DEFINITION

Classification: 33/122

(under subclass 121) Area integrators having a tracing member designed to travel around the outline of the area to be determined, and frequently specially designed to determine effective pressure and horsepower from engine indicator diagrams.