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Use of pulsating pressures for increasing the permeability of underground structures
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Earth penetrating apparatus
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Hydraulically operated bit drive
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Pressurized containers and method of filling the same
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Oscillating system for impregnating sheet material
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Torsionally oscillating oil well drive bit
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Means for raising liquids from great depths
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Means and method of filling cans with pressurized substances
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Doffer comb
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Variable speed drive
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Apparatus for generating large mechanical vibrations
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Means and method of sealing plastic materials
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Comminuting machine with opposed and axially oscillated rotors
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Communication in pipe lines
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Rotary casting machine
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