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  2. List of gridiron football rules - Wikipedia

    en.wikipedia.org/wiki/List_of_gridiron_football...

    A standard football game consists of four 15-minute quarters (12-minute quarters in high-school football and often shorter at lower levels, usually one minute per grade [e.g. 9-minute quarters for freshman games]), [6] with a 12-minute half-time intermission (30 minutes in the Super Bowl) after the second quarter in the NFL (college halftimes are 20 minutes; in high school the interval is 15 ...

  3. High-altitude military parachuting - Wikipedia

    en.wikipedia.org/wiki/High-altitude_military...

    United States Air Force Pararescuemen jump at half the height of a typical HALO/HAHO insertion 2eme REP Legionnaires HALO jump from a C-160.. High-altitude military parachuting, or military free fall (MFF), is a method of delivering military personnel, military equipment, and other military supplies from a transport aircraft at a high altitude via free-fall parachute insertion.

  4. Barbed wire - Wikipedia

    en.wikipedia.org/wiki/Barbed_wire

    U.S. patent 167,240 – Jacob Haish, DeKalb, Illinois, Improvement in Wire-fence Barbs – "single piece of wire bent into the form of the letter S" so that both strands are clasped (1875) U.S. patent 185,346 – John Nelson, Creston, Illinois, Improvement in Wire-fence Barbs – barb installable on existing fence wire, (1876)

  5. Stoplogs - Wikipedia

    en.wikipedia.org/wiki/Stoplogs

    Stoplogs are typically used in structures where the removal, installation, and replacement of the logs is expected infrequently. When larger flows of water are passing through a stoplog gate, it can be difficult to remove or place individuals logs. Larger logs often require multiple people to position and lift the logs.

  6. Gate - Wikipedia

    en.wikipedia.org/wiki/Gate

    Gate from Bucharest (Romania) Art Nouveau gate of Castel Béranger (Paris) Candi bentar, a typical Indonesian gate that is often found on the islands of Java and Bali. A gate or gateway is a point of entry to or from a space enclosed by walls. The word derived from old Norse "gat" [1] meaning road or path; But other terms include yett and port.

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  8. Military Freefall Parachutist Badge - Wikipedia

    en.wikipedia.org/wiki/Military_Freefall...

    To attend the Military Free-Fall JumpMaster Course (MFFJMC), students must have graduated from the U.S. Army Airborne School, the MFFPC, the U.S. Army Jumpmaster School, be a current military free-fall parachutist, served as a military free-fall parachutist for a minimum of one year, and must have completed at least 50 military free-fall jumps.

  9. Stile - Wikipedia

    en.wikipedia.org/wiki/Stile

    Many legacy stiles remain, however, in a variety of forms (as is also the case in the US, where there is no standard). As well as having a variety of forms, modern stiles also sometimes include a 'dog latch' or 'dog gate' to the side of them, which can be lifted to enable a dog to get through. A squeeze stile