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The Ontario high school physics (1917)
Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 80
Fig. 71.—Nutcrackers, lever of thesecond class. Fig. 72. —Trimming board for cutting paper orcardboard ; lever of the second class.Physics
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