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Note: | 1,* Or uses the series for the overseas drilling machine with the drill rod series; |
| 2,Outside the combined drill rod has 3 machine locks, in 2 frictional resistance |
compositions, (work as in draw off 2 frictional resistance, install the 4th machine |
lock, then may promote 4 machine to lock type drill rod); |
3,machine lock the type drill rod, when a draw off most in drill rod, installs the 4th, |
5frictional resistance type drilling machine, then may promote 5 combined drill rods. |
(partial products may promotion) |
4,Surpasses the table specification drill rod, may has custom-made specially according |
to the user's needs and the main engine performance. |