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2. 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.

3. Hush kit - Wikipedia

   en.wikipedia.org/wiki/Hush_kit

   Rolls-Royce Conway Mk508 (1959) with hush kit attached. The most common form of hush kit is a multi-lobe exhaust mixer.This device is fitted to the rear of the engine and mixes the jet core's exhaust gases with the surrounding air and a small amount of available bypass air.

4. 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 ...

5. 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!

6. Eckel Industries - Wikipedia

   en.wikipedia.org/wiki/Eckel_Industries

   The Orfield Labs chamber was certified by the Guinness Book of World Records in 2005 as the quietest room on Earth. [2] [3] The Eckel anechoic chamber located at Microsoft in Redmond, Washington was certified by the Guinness Book of World Records as the quietest place on earth in 2015, measuring -20.6 dB. [4]

7. Cox model engine - Wikipedia

   en.wikipedia.org/wiki/Cox_model_engine

   Very similar to the later QRC engine which reportedly worked better. Cox also sold the muffler, cylinder and high comp. glow head components of the QZ as a Muffler Conversion Kit (Cat#495) for $2.98. 1976 QRC (Cat#450-1 - manufactured 1976–1996) The QRC was a modified Babe Bee engine that had a muffler and larger (8cc) fuel tank.