1. The contact angle of the body is ascertained from the roll duration, the rolling path, and the roll angle.

2. Apparatus for borehole measurement, including measurement in relation to azimuth, inclination, magnetic tool face angle, gravity roll angle, magnetic field strength, temperature and dip

3. Installation, service and repair services relating to instruments which measure azimuth, inclination, magnetic tool face angle, gravity roll angle, magnetic field strength, temperature, orientation or dip

4. Rental of apparatus for borehole measurement, rental of instruments for measuring azimuth, inclination, magnetic tool face angle, gravity roll angle, magnetic field strength, temperature, orientation or dip