(under subclass 1.01) Subject matter wherein either (a) the apparatus for proving or calibrating the device or (b) the device being proven or calibrated (1) measures the figure formed by two lines diverging from a common point (i.e., angle), (2) a position to which motion or another position is referred (i.e., direction), or (3) a deviation from a horizontal or vertical reference point (i.e., inclination).
SEE OR SEARCH CLASS
33, Geometrical Instruments, appropriate subclasses for instruments for measuring an angle, a direction, or an inclination.
