US PATENT SUBCLASS 73 / 115
.~ Pressure derivative

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

112  DF  POWER PLANT OR UNIT EFFICIENCY {2}
115.~ Pressure derivative

DEFINITION

Classification: 73/115

(under subclass 112) Subject matter utilizing the pressure within an engine as a factor of its performance or efficiency.

SEE OR SEARCH CLASS

346, Recorders, appropriate subclass.