Johansson block

noun
Jo·​hans·​son block | \(ˈ)jō¦han(t)sən-\

Definition of Johansson block 

: one of a set of gage blocks ground to an accuracy of one hundred-thousandth of an inch or better

called also Jo block

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History and Etymology for Johansson block

after C. E. Johannson, 20th century Swedish engineer

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