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2. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   A round manhole and its cover. A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.

3. Defensive fighting position - Wikipedia

   en.wikipedia.org/wiki/Defensive_fighting_position

   A foxhole is one type of defensive strategic position. It is a "small pit used for cover, usually for one or two personnel, and so constructed that the occupants can effectively fire from it". [ 1 ] It is known more commonly within United States Army slang as a " fighting position " or as a " ranger grave ". It is known as a " fighting hole ...

4. Snap cap - Wikipedia

   en.wikipedia.org/wiki/Snap_cap

   An assortment of snap caps of varying calibers, from left: (1st row) .22 LR, 9mm (both), .45 ACP, (2nd row) 30-06 (both), (3rd row) 12 Ga. A snap cap is a firearm accessory device shaped like a standard cartridge/shotshell but contains no functional components, namely the primer, propellant and projectile (bullet or slug).

5. Percussion cap - Wikipedia

   en.wikipedia.org/wiki/Percussion_cap

   Percussion caps have been manufactured in various sizes to fit snugly over different sized nipples. Nipples for 4.5mm and 6mm percussion caps. The percussion cap, percussion primer, or caplock, introduced in the early 1820s, is a type of single-use percussion ignition device for muzzle loader firearm locks enabling them to fire reliably in any weather condition. [1]

6. .22 BB - Wikipedia

   en.wikipedia.org/wiki/.22_BB

   20 ft⋅lbf (27 J) Source (s): Cartridges of the World[1] A .22 CB Cap, .22 short, and .22 Long Rifle; the CB Cap is the same length as the BB Cap, but uses a conical bullet. .22 BB Cap (Bulleted Breech Cap), also known as the 6mm Flobert, is a variety of .22 caliber rimfire ammunition. Invented by Louis-Nicolas Flobert in 1845, it was the ...

7. Homestake Mine (South Dakota) - Wikipedia

   en.wikipedia.org/wiki/Homestake_Mine_(South_Dakota)

   Homestake Mine (South Dakota) Coordinates: 44°21′22″N 103°45′53″W. The Homestake Mine pit in Lead, South Dakota. Typical auriferous greenschist gold ore from the Homestake Mine. Two small masses of native gold (Au) are visible near the bottom right. The Homestake Mine was a deep underground gold mine (8,000 feet or 2,438 m) located in ...