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US4834212A - Sound muffler for covering the mouth -

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3.0 Exhaust Muffler Design Principles 3.1 Basic Concepts

higher frequencies when the cross axis dimension of the muffler is 82% of the acoustic wavelength (Davis, Stokes, Moore and Stevens [5]). Some expansion chamber muffler systems are also packed with sound absorbing material which helps to improve the high frequency attenuation. In all muffler designs the tailpipe length can have an important effect.Breath Valve PM2.5 Mouth Mask Anti Virus, Influenza, Anti , chn mouth muffle improveDustproof Mouth Face Mask Anti bacterial Pollen Women Men Mouth Muffle Face Mouth Masks Activated carbon filter protective mask. US $4.61. 4.8 , chn mouth muffle improve Basketball, Calf Knee Pain Relief, Improve Blood Circulation. US $2.98. 4.6 (268) 536 Orders. Anti Pollution PM2.5 Mouth Mask Dust Respirator Washable Reusable Masks Cotton Unisex Mouth Muffle for , chn mouth muffle improveUrban Dictionary: muffin mouthwhen a dog has extremely muffin like lips. Urban Dictionary and our advertising partners set cookies on your computer to improve our site and the advertisements you see.

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