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Which sewing machine company has held a patent on the mechanism that creates the blanket stitch?

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Which sewing machine company has held a patent on the mechanism that creates the blanket stitch since its introduction in 1877 (the most recent patent renewal was in 2007), and is involved in litigation with several Chinese firms who are accused of violating their intellectual property rights?

ABrother
BBernina
CMerrow
DSinger

Correct Option: 3  
posted Jan 30, 2018 by Amarvansh

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