Mechanical piston drills making use of hooked up bits on drill rods and moving up and down similar to a piston inside a cylinder day from 1843. In Germany in 1853 a drill that resembled present day air drills was invented. Piston drills ended up superseded by hammer drills run https://sethykquy.blogofoto.com/67739712/how-precious-metals-can-save-you-time-stress-and-money