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
From the M-W Editors
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Origin and Etymology of johansson block
after C. E. Johannson, 20th century Swedish engineer
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