US PATENT SUBCLASS 356 / 913
.~ Theodolites (GO1C 1/02)

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

912  DD  MEASURING ANGLES (GO1C 1/00) {2}
913.~ Theodolites (GO1C 1/02) {1}
914  DD  .~.~> Combined with cameras (GO1C 1/04)