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2. Rebreather diving - Wikipedia

   en.wikipedia.org/wiki/Rebreather_diving

   Values ranging from around 1.4 bar for a short dive to 1.0 bar for a very long dive can be used, with 1.2 to 1.3 bar being a frequent general purpose compromise. (see US Navy rebreather tables). The decompression set-point tends to be a bit higher to accelerate elimination of inert gases, while retaining a low risk of oxygen toxicity.

3. Robotics - Wikipedia

   en.wikipedia.org/wiki/Robotics

   Others replace people in jobs that are boring, repetitive, or unpleasant, such as cleaning, monitoring, transporting, and assembling. Today, robotics is a rapidly growing field, as technological advances continue; researching, designing, and building new robots serve various practical purposes.

4. Law enforcement in the United States - Wikipedia

   en.wikipedia.org/wiki/Law_enforcement_in_the...

   Law enforcement in the United States uses a variety of VHF, UHF, or digital trunked radio transceivers mounted in their vehicles, with individual officers carrying portable handsets or ear-worn headsets for communication when away from their vehicles. Frequencies, channels, equipment, and radio usage procedures vary by jurisdiction.