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A self-unloading steel or reinforced-concrete (occasionally wooden) receptacle (container, coffer, or bin) for the bulk storage of granulated or lumpy materials such as grain, sand, cement, coke, coal, or ore. To permit gravity unloading, the lower portion of a bunker is built with inclined walls (for example, in the form of inverted truncated cones or pyramids). There are also doors and conveyors in the lower part to control discharge of the material. The modern bunker is a highly automated unit having centralized control for loading and unloading and for monitoring filling, discharge, and the level of stored material with programmed control. “Bunker” is also the name for magazine equipment that feeds workpieces to automated lines and for the containers on certain machines, such as reapers.
(2) A ship’s bunker, a place on a ship for storing the regular supply of solid fuel usually connected with the boiler compartment; the fuel supply (solid or liquid) that is calculated on the basis of the length of a voyage, with the addition of a so-called storm supply.
(3) In German military terminology, a bunker is a shelter or emplacement.