US PATENT SUBCLASS 700 / 66
.~.~ Having particular position determining apparatus (e.g., portable or handheld)

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

1  DD  GENERIC CONTROL SYSTEM, APPARATUS OR PROCESS {15}
56  DD  .~ Digital positioning (other than machine tool) {5}
66.~.~ Having particular position determining apparatus (e.g., portable or handheld)