US$ 142.25
Double-parallel plastic pulley with two 50mm wheels in a steel frame and end hooks
overhead spring
and a motor accessory
providing 220V excitation for atomic emission spectroscopy tubes
Triple-Long Metal Pulley Item Type_Springs Double-parallel plastic pulley with twoThree wheel stacked metal pulley for maximum mechanical advantage in compound pulley systems, sized for advanced simple machines experiments in physics instruction.
US$ 142.25
US$ 119.40
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