US PATENT SUBCLASS 700 / 58
.~.~.~ Having position marking


Current as of: June, 1999
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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}
57  DD  .~.~ Alignment or registration {2}
58.~.~.~ Having position marking