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As far back as the first century, Pliny the Elder described a filtering device for use against vermillion dust. Leonardo da Vinci (1452-1519) was concerned with providing respiratory protection against chemical warfare agents and suggested using a wet cloth. Also in the 16th century, Agricola described the respirator-like devices used in mines.
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Using persuasive messages to encourage voluntary hearing protection among coal miners Michael T. Stephenson, Kim Witte, Charles Vaught, Brian L. Quick, Steve Booth-Butterfield, Dhaval Patel, Cynthia Zuckerman Department of Communication, Texas A&M University, 4234 TAMLI, College Station, TX 77843-4234, United States Abstract
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Fig. 3 Connection of pulse generator and EMI input filter SUN Ji-ping et al Improved complex filter applied in enhancing EFT/B immunity at a coal mine 25 If Ce represented the coupling capacitance of the coupling network whose value was 33 nF, then C3 and C4 represent the capacitors to the filter difference mode interference.
