A sewn product is protected from being stained by melted leavings of a work material by cooling a needle moving at a high speed, and thus the quality of the product may be enhanced when the work material is sewed by a presser foot of the present invention, and a sewing machine using the same, wherein the presser foot is provided with a fluid line for injecting a fluid toward the needle.

 
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> Method for simultaneous removal of asphaltene, and/or paraffin and scale from producing oil wells

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