| http://www.w3.org/ns/prov#value | - As heretofore stated, the outer or front and rear walls 206, 206' of the main fluid chamber 200 are made from a rigid or substantially rigid material, such as sheet metal, and each of the compartments or sub-chambers C, D has high-frequency vibrational waves (ultrasonic) created therein which are in zones extending transversely or laterally of the path of travel of the web material W-l.
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