US PATENT SUBCLASS 33 / 453
.~.~ Triangulation (e.g., solving trigonometric functions)

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33 /   HD   GEOMETRICAL INSTRUMENTS

403  DF  STRAIGHTEDGE TYPE {16}
452  DF  .~ Plural straightedges, relatively moveable {6}
453.~.~ Triangulation (e.g., solving trigonometric functions)

DEFINITION

Classification: 33/453

Triangulation (e.g., solving trigonometric functions):

(under subclass 452) Subject matter including means for the measurement of triangles on the earth's surface (e.g., surveying) or broadly for performing any similar trigonometric operation for finding a position or location by means of bearings from two fixed points a known distance apart.