US PATENT SUBCLASS 356 / 912
MEASURING ANGLES (GO1C 1/00)

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

912MEASURING ANGLES (GO1C 1/00) {2}
913  DD  .~> Theodolites (GO1C 1/02) {1}
915  DD  .~> Sextants (GO1C 1/08)