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Improved guillotine window, especially for the fact that three windows are arranged in the window frame, the upper glass being mounted fixed on said frame, while the other two are vertically movable and because the intermediate glass is of a weight greater than that of its counterweight, which allows it to fall by gravity, the weight of the lower glass being smaller than that of its counterweight, this latter glass being provided with a handle-stop that facilitates its upward and downward movement and also causes, in an upward direction, the displacement of the intermediate glass and because the sum of the weight of the two displaceable glasses balances and equals the sum of the weight of the two counterweights. (Machine-translation by Google Translate, not legally binding)