Usually means: Pulley system atop drilling rig.
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We found 5 dictionaries that define the word crown block:

General (2 matching dictionaries)
  1. crown block: Merriam-Webster
  2. Crown block: Wikipedia, the Free Encyclopedia

Computing (2 matching dictionaries)
  1. crown block, Crown block: Encyclopedia

Tech (1 matching dictionary)
  1. Schlumberger Oilfield Glossary (No longer online)

Definitions from Wikipedia (Crown block)

noun:  A crown block is the stationary section of a block and tackle that contains a set of pulleys or sheaves through which the drill line (wire rope) is threaded or reeved and is opposite and above the traveling block.


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