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Seal-O-Matic Corporation, a family owned business established in 1933, was one of the pioneers in the shipping and packaging industry. In 1950 we expanded into the safety market by manufacturing our first patented safety knife, the Lewis K310-3. The success of this knife was the stepping stone to opening the Lewis Safety Knife Co. which, over the years, developed other safety tools including safety box openers, safety staple removers, safety carton reducers, and safety tape dispensers.