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core barrel

noun
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Definition of core barrel

1 : a tube inside a drill pipe and supported by a bit to receive the core in core boring
2 : a tube usually of iron on which a foundry loam core is formed

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“Core barrel.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/core%20barrel. Accessed 21 Apr. 2021.

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