US PATENT SUBCLASS 388 / 906
.~ Proportional-integral system

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388 /   HD   ELECTRICITY: MOTOR CONTROL SYSTEMS

900  DF  SPECIFIC SYSTEM OPERATIONAL FEATURE {6}
906.~ Proportional-integral system

DEFINITION

Classification: 388/906

Proportional-integral system:

Art collection of systems with means to correct both instantaneous (i.e., proportional) errors and long term average (i.e., integral) errors.