The bench drill is used to draw out samples of precious metals to be assayed. It is a high precision bench drill mounted on oversized ball bearings. The pulley bush and the drill chuck spindle are made out of rectified iron. These characteristics...
The bench drill is used to draw out samples of precious metals to be assayed. It is a high precision bench drill mounted on oversized ball bearings. The pulley bush and the drill chuck spindle are made out of rectified iron. These characteristics...