Rollers
A Military Dictionary · 1810 · p. 38
are round pieces of wood of about nine inches diameter, and four feet long, used in moving pieces of artillery from one place to another.
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Adair's New Encyclopedia (1923)
Encyclopedia Sinica (1917)
Dictionary of Science, Literature and Art (1854)
Dictionary of Science, Literature and Art (1842)
Friction Rollers
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A Dictionary of Military Terms (1918)
Friction-rollers
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Nuttall's Standard Dictionary of the English Language (1890)
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