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2. Pallet racking - Wikipedia

   en.wikipedia.org/wiki/Pallet_racking

   Pallet racking made from Dexion slotted angle. Pallet rack is a material handling storage aid system designed to store materials on pallets (or “skids”). Although there are many varieties of pallet racking, all types allow for the storage of palletized materials in horizontal rows with multiple levels.

3. Self-contained breathing apparatus - Wikipedia

   en.wikipedia.org/wiki/Self-contained_breathing...

   A self-contained breathing apparatus (SCBA) is a respirator worn to provide an autonomous supply of breathable gas in an atmosphere that is immediately dangerous to life or health from a gas cylinder. [1]

4. Presidency of Barack Obama - Wikipedia

   en.wikipedia.org/wiki/Presidency_of_Barack_Obama

   Obama also advocated for universal pre-kindergarten programs, [172] and two free years of community college for everyone. [173] Through her Let's Move program and advocacy of healthier school lunches, First Lady Michelle Obama focused attention on childhood obesity , which was three times higher in 2008 than it had been in 1974. [ 174 ]

5. Concrete - Wikipedia

   en.wikipedia.org/wiki/Concrete

   Concrete, as the Romans knew it, was a new and revolutionary material. Laid in the shape of arches, vaults and domes, it quickly hardened into a rigid mass, free from many of the internal thrusts and strains that troubled the builders of similar structures in stone or brick. [22]

6. Silencer (firearms) - Wikipedia

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

   Different silencer designs. Gun rights advocates, gun media and the firearms industry generally claim that the word "silencer" is defined as meaning total silence, while "suppressor" or "moderator" are defined as meaning only reduced sound intensity, in spite of its original definition.