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Correction for the height of a Bowling Pin

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How long is 4.20 shaftments?
It's about one-and-two-thirds times as tall as a Bowling Pin
The height of a Bowling Pin is about 2.50 shaftments.
(USBC specifications; tenpin)
According to the United States Bowling Congress specifications, a tenpin bowling pin should be within 0.00521 shaftments of 2.50 shaftments in height. The USBC further mandates that certified pins be made of sugar maple wood, unless otherwise approved by the organization.
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