Beehive coke ovens were called that because they were built in a beehive-like hemispherical shape, and then covered with earth. Cross section of a Hand-drawn Beehive Coke Oven. The Beehive Ovens were built in banks of ovens, called a battery, with a strong retaining wall in front, and then covered with earth.
One such technique is called âbumping.â Lock bumping, also referred to as key bumping is an attack technique using specially cut keys, known as bump keys, that can defeat conventional pin and tumbler door locks.
The Bump Key. A bump key is required for lock bumping to be effective. The key must be the appropriate size for the lock, but the only other requirement is that each ridge in the key is cut to maximum depth. People often refer to bump keys as â999 keysâ because each ridge is cut to a depth of nine in a key-making machine.