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2. Automatic quartz - Wikipedia

   en.wikipedia.org/wiki/Automatic_quartz

   'Seiko Quartz Automatic Generating System' (A.G.S. = early Kinetic), Perpetuum Nobile (produced in 1989), Cal. 7M45, No. 246 of 700 Seiko AGS SCUBA Diver 200m 5M23-6A60, 1993 Automatic quartz is a collective term describing watch movements that combine a self-winding rotor mechanism [ 1 ] (as used in automatic mechanical watches ) to generate ...

3. Seiko - Wikipedia

   en.wikipedia.org/wiki/Seiko

   Portrait of Kintarō Hattori, 1916. In 1881, Seiko founder Kintarō Hattori opened a watch and jewelry shop called "K. Hattori" (服部時計店) in Tokyo. [12]Kintarō Hattori had been working as clockmaker apprentice since the age of 13, with multiple stints in different watch shops, such as “Kobayashi Clock Shop”, run by an expert technician named Seijiro Sakurai; “Kameda Clock Shop ...

4. World record progression 200 metres butterfly - Wikipedia

   en.wikipedia.org/wiki/World_record_progression...

   Graphs of the progression of the World Records in all four strokes (50m, 100m and 200m distances). This is a history of the progression of the World Record for the Swimming event: the 200 Butterfly. It is a listing of the fastest-time-ever swum in the event, in both long course (50m) and short course (25m) swimming pool.

5. Diving rebreather - Wikipedia

   en.wikipedia.org/wiki/Diving_rebreather

   The diver breathes through a mouthpiece or a full-face diving mask with a shut-off valve, the dive/surface valve, which is closed when the diver is not breathing from the unit to prevent flooding if the set is in the water. This is connected to one or two breathing hoses ducting inhaled and exhaled gas between the diver and a counterlung or ...

6. Rebreather diving - Wikipedia

   en.wikipedia.org/wiki/Rebreather_diving

   The diver should keep breathing constantly to maintain consistent gas flow at moderate flow velocities over the carbon dioxide absorbent, so the absorbent can work most effectively. Divers need to lose any skip-breathing habits that may have been developed while diving with open-circuit scuba. In closed circuit rebreathers, constant moderate ...

7. David's Sling - Wikipedia

   en.wikipedia.org/wiki/David's_Sling

   David's Sling Stunner missile launch during tests, 2015. David's Sling (Hebrew: קלע דוד, romanized: Kela David), also formerly known as Magic Wand (Hebrew: שרביט קסמים, romanized: Sharvit Ksamim), is an Israel Defense Forces military system jointly developed by the Israeli defense contractor Rafael Advanced Defense Systems and the American defense contractor Raytheon, that ...