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The company was founded due to Leo J. Wahl's patent for an electromagnetic hair clipper in 1919. In 1965 Wahl introduced the first vacuum clipper, which allowed a person's hair to be cut without use of a cape.
In 1967, Wahl produced the first cordless hair clipper using rechargeable battery technology. Four years later, it started an electronics division with the first cordless and rechargeable soldering iron. In 1975, Wahl released a line of back and foot massagers utilizing the vibrating motor technology used in their hair trimmers. In 1984, Wahl invented the first cordless consumer beard and mustache trimmer.
In 2001, it patented the first vacuuming consumer beard trimmer, the Trim N Vac. Wahl manufactures its clippers and trimmers in its own factories in Sterling, Illinois; Germany, England, China, and Hungary.
Wahl is also a brand of men's trimmers including trimmers for beards, mustaches, goatees, body, ear, nose, and brow.
Products are sold in over 150 countries worldwide under the brands Wahl, Moser, Lister and more recently Groom Ease. In 2006 Wahl licensed the For Dummies brand from John Wiley & Sons publishing company and launched the Home Haircutting for Dummies product line.