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    A. Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back ...

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    Displays in the Carlsbad Miniature Engineering Craftsmanship Museum. High quality models like this Bucyrus-Erie Shovel were never intended to be toys.

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    Carbon (from Latin: carbo "coal") is a chemical element with symbol C and atomic number 6. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds.

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    Abutment — In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back ...

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    The Heroic R.R.O.D. trope as used in popular culture. The Heroic Red Ring of Death occurs when a hero has pushed him/herself too hard and abruptly starts to …

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    A crane is a machine that is capable of raising and lowering heavy objects and moving them horizontally. Cranes are distinguished from hoists, which can lift objects but that cannot move them sideways.

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  • BELTS AND LINKS . The subject of ammunition feeding systems is largely overlooked by aficionados of the Browning Caliber .30 machine guns. "Its a cloth belt", or "I shoot links", is about as far as the conversation usually goes.

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