Typically, coke-oven gas is obtained from a battery comprising a number of narrow, vertical chambers, or ovens (0.5m wide, 5m high and 12m long) built of silica brick that are separated by heating ducts, such that heat is transmitted to the coal through both sides of the chamber walls.
ISO keyboard symbol for âControlâ. In computing, a Control key is a modifier key which, when pressed in conjunction with another key, performs a special operation (for example, +); similar to the Shift key, the Control key rarely performs any function when pressed by itself.
Unless a lock is malfunctioning or a totally different style is desired, many locks can be rekeyed and kept in service, operating as well or better than ever. The most common reason to rekey the locks is to maintain key control when there is a change in possession of a property. Key control simply means accounting for all keys made to operate the locks. Once keys are loaned out, key control is lost.