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2. Multi-directional Impact Protection System - Wikipedia

   en.wikipedia.org/wiki/Multi-directional_Impact...

   MIPS (Multi-directional Impact Protection System) is a head-protection system designed to enhance the safety of various helmets. Rotational motion results in shearing and/or stretching of brain tissue and increases the risk of brain injuries. [ 1 ]

3. 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 ...

4. Surface-supplied diving equipment - Wikipedia

   en.wikipedia.org/wiki/Surface-supplied_diving...

   The spring force is adjustable by the diver to prevent the suit from deflating completely or over-inflating and the diver being floated uncontrollably to the surface. Some helmets have an extra manual valve known as a spit-cock, which can be used to vent excess air when the diver is in a position where the main exhaust can not function correctly.

5. Human factors in diving equipment design - Wikipedia

   en.wikipedia.org/wiki/Human_factors_in_diving...

   The exhaust valve should offer the minimum resistance to exhalation, including a minimum opening pressure difference, and low resistance to flow through the opening. It should not easily block or leak due to foreign matter such as vomit. Exhaust gas flow should not be too distracting or annoying to the diver in a normal diving posture.

6. Modular Integrated Communications Helmet - Wikipedia

   en.wikipedia.org/wiki/Modular_Integrated...

   A pad system and four-point retention system, similar to the cushions and straps found on the aforementioned skate, bicycle, and water helmets, replaces the nylon cord suspension system, sweatband and chinstrap found on the PASGT helmet. [8] The change provides greater impact protection and comfort for the wearer.

7. Mechanism of diving regulators - Wikipedia

   en.wikipedia.org/wiki/Mechanism_of_diving_regulators

   The exhaust manifold (exhaust tee, exhaust cover, whiskers) is the ducting that protects the exhaust valve(s) and diverts the exhaled air to the sides so that it does not bubble up in the diver's face and obscure the view. This is not necessary for twin hose regulators as they exhaust air behind the shoulders. [4]: 33