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Lemon Squeezer What is it? The lemon squeezer is a device that uses levers and a grate to extract lemon juice from lemons by squeezing them. In this sense, the lemon squeezer is a form of Second Class Lever. African American inventor John Thomas White is credited with inventing it and was awarded a patent in 1896. Give me an example! You can use a lemon squeezer to make fresh lemonade! Copyright ©2010, PCS Edventures, Inc. All Rights Reserved.