Contour measuring device and method

Control system for earth boring tool

Cornerbead alignment apparatus

Correction apparatus for an azimuth calculating system

Correction method and device for a magnetic field probe

Course indicator

Crane level indicator device

Cross vial liquid bubble illuminated level

Cylindrical squaring collet leveler for vertical milling machine

Dark-banded vial for use with level

Decorative frame molding

Depth correction

Detector for sensing the angular position of a rotatable magnet

Determination of borehole azimuth and the azimuthal...

Determination of borehole azimuth and the azimuthal...

Determining a borehole azimuth from tool face measurements

Device and method for arranging a flat panel display

Device for ascertaining the camber and caster positions of vehic

Device for detecting magnetic azimuth

Device for detecting positional changes