Hughes inherited Toolco in 1924 at the age of 18 from his father, who had invented a triple-headed conical drilling bit that revolutionized the oil-drilling business.
From the time.com
The Plan A drill had stopped drilling while its bit was being changed, Sougarret said.
From the cnn.com
Due to its design, a single bit can be used for drilling a wide range of hole sizes.
From the en.wikipedia.org
The term drill may refer to either a drilling machine or a drill bit for use in a drilling machine.
From the en.wikipedia.org
The BP disaster will not change drilling plans one bit.
From the orlandosentinel.com
For metalwork, this is countered by drilling a pilot hole with a spotting drill bit.
From the en.wikipedia.org
Friction from drilling can make the ice melt and refreeze, trapping the drill bit.
From the newscientist.com
Comprehensive knowledge of drilling and drill bit systems, business plans, customer requirements, and market demands.
From the jobview.monster.com
Rock powder generated during drilling travels up flutes on the bit.