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speed cone

noun
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Definition of speed cone

1 : stepped pulley
2 : one of a pair of conical pulleys connected by a short belt that can be adjusted to permit fine variations of speed

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“Speed cone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/speed%20cone. Accessed 15 Jun. 2021.

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