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Herbarz Miast Polskich
The arms were officially adopted on March 30, 2012.
The town of Młynarze has taken its name from three mills on the River Róż, symbolized by the three waterwheels. The crown with the star is one of the elements of the coat of arms of the Płock cathedral chapter, granted to the chapter by Emperor Maximilian I in 1516. The area historically was owned by the chapter. The colors of the coat of arms were taken from the coat of arms of Mazovia