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Key
  A small, parallel-sided piece, flat or tapered on top, for securing pulleys and other parts to shafts.
 
Keyway
  A groove or channel for a key, as in a shaft or the hub of a pulley; a keyseat.
 
Kilogram (kg)
  The basic unit of mass in the SI system, equal to 1,000 grams (approximately 2.2 lbs).
 
Kilometre (km)
  A measure of length equal to 1,000 metres or 0.62 miles.
 
Kimberlite
  The most common host rock of diamonds.
 
Kinetic energy
  Energy that a substance or body has by virtue of its mass (weight) and velocity.
 
Koepe Hoist
  Friction hoisting system in which the winding drum is replaced by large wheels or sheaves over which an endless rope passes.
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