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2. Hush kit - Wikipedia

   en.wikipedia.org/wiki/Hush_kit

   Hush kit for the Pratt and Whitney JT8D-1 through -17 engines Two JT4As installed on a KLM DC-8. A hush kit is an aerodynamic device used to help reduce the noise produced by older aircraft jet engines. These devices are typically installed on older turbojet and low-bypass turbofan engines, as they are much louder than later high-bypass ...

3. Orfield Laboratories - Wikipedia

   en.wikipedia.org/wiki/Orfield_Laboratories

   Orfield Labs held the 2005 and 2013 Guinness World Record for the quietest place on Earth. Microsoft ’s anechoic chamber in Redmond, Washington eventually beat Orfield. Orfield retook the record in November 2021 with a sound level of (-)24.9 dbA.

4. Silencer (firearms) - Wikipedia

   en.wikipedia.org/wiki/Silencer_(firearms)

   The muffler for internal combustion engines was developed in parallel with the firearm silencer by Maxim in the early 20th century, using many of the same techniques to provide quieter-running engines, and in many English-speaking countries automobile mufflers are called silencers. [10]

5. Welrod - Wikipedia

   en.wikipedia.org/wiki/Welrod

   The Welrod is designed for use by irregular forces and resistance groups, and is an extremely quiet gun due to its integrated silencer. Approximately 2,800 were made in wartime and perhaps 14,000 in total when post-war examples are included. [1]

6. Muffler - Wikipedia

   en.wikipedia.org/wiki/Muffler

   Silencer (silver) and exhaust pipe on a Ducati motorcycle A silencer cut open to show the insulation, chambers and piping inside the shell. A muffler (North American and Australian English) [1] or silencer (British English) is a device for reducing the noise emitted by the exhaust of an internal combustion engine—especially a noise-deadening device forming part of the exhaust system of an ...

7. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!