Hall's Carriage with 1.25" Wheels, 5.25 x 1.2" Subject_Earth Science specific gravity specific gravity 3 meter wooden trolley runway providing a smooth rolling smoothly across inclined and level surfaces in friction and motion experiments 2 inches with 1
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Hall's Carriage with 1.25" Wheels, 5.25 x 1.2" Subject_Earth Science specific-gravity