In 1923, Richard Drew joined the 3m company located in St. Paul, Minnesota. At the time, 3M only made sandpaper. Drew was product testing 3M's Wetordy brand sandpaper at a local auto bodyshop, when he noticed that autopainters were having a hard time making clean dividing lines on two-color paint jobs. Richard Drew was inspired to invent the world's first masking tape in 1925, as a solution to the auto painter's dilemma.
Source: http://inventors.about.com/od/sstartinventions/a/Scotch_Tape.htm
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