Use a Pulley: Simple Machines-Pulleys
$3.96
Sale price
$3.96
Regular price
$6.00
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Grandfather gave some jobs to a lazy boy. The clever boy came up with ideas to make the jobs easier. Let's find out how the boy used pulleys.
Use a Pulley: Simple Machines-Pulleys
$3.96
Sale price
$3.96
Regular price
$6.00