US PATENT SUBCLASS 700 / 67
.~ Plural variables


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700 /   HD   DATA PROCESSING: GENERIC CONTROL SYSTEMS OR SPECIFIC APPLICATIONS

1  DD  GENERIC CONTROL SYSTEM, APPARATUS OR PROCESS {15}
67.~ Plural variables {2}
68  DD  .~.~> Ratio
69  DD  .~.~> Positional (e.g., velocity, acceleration) {1}