HORIZONTAL DIRECTIONAL DRILLING RIG (HDDR) WITH MECHANICAL PIPE HANDLING. A SELF-PROPELLED RUBBER TRACKED DRILLING UNIT ON, AND INTEGRAL TO, A HEAVY DUTY FRAME. POWERED BY A 188 HP TURBO-DIESEL ENGINE. OPTIONAL FEATURES INCLUDE: PIPE LOADER (HOLDS 9 PIECES OF 15' DRILL PIPE), DRILLING FLUID PUMP, ON-BOARD HYDRAULIC BOOM CRANE AND DRILL PIPE. THE HDDR FUNCTION IS FOR USE IN MOBILE 'TRENCHLESS' OPERATIONS. CONSIDERED TO BE A SELF-PROPELLED, WHEELED EARTH-BORING/DRILLING MACHINE, IN WHICH THE CHASSIS AND THE WORKING MACHINE ARE SPECIALLY DESIGNED FOR EACH OTHER AND FORM AN INTEGRAL MECHANICAL UNIT, AND NOT SIMPLY A MACHINE MOUNTED ON AN AUTOMOBILE CHASSIS.

CLASSIFICATION IS DETERMINED IN ACCORDANCE WITH THE PROVISIONS OF G.I.R.'S 1 AND 6, AS WELL AS THE TEXT OF HEADINGS 8430, 843041 AND 84304100 (OTHER BORING MACHINERY: OTHER BORING OR SINKING MACHINERY: SELF-PROPELLED).