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In the drawings, Sheets 1, 2, 3 and 4, the title, "NATURAL FREQENCY VIBRATING SCREEN" should-read NATURAL FREQUENCY VIBRATING SCREEN Column 9, line 59, "frome" should read frame Column 10, line 19, "acut" should read acute Signed and sealed this 26th day of May 1970.

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The entire two-basket assembly is mounted to a stationary base frame by means of a set of vertically arranged support springs between the upper basket and the frame. Thus the invention provides a natural frequency vibrating screen apparatus having two masses and two spring systems.

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Natural Frequency. The equation for the natural frequency of vibration is: Where; f n = undamped natural frequency (Hz). k = spring stiffness (N/m). m = mass (kg). Note! This equation will not work in mm! This shows that in order to raise the natural frequency, we can either increase the …

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