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2. Propane bomb - Wikipedia

   en.wikipedia.org/wiki/Propane_bomb

   Both bombs failed to detonate, so the two students opened fire anyway, killing 12 students and 1 teacher, and injuring 21 others before both committing suicide. Another 20-pound (9.1 kg) propane bomb was found south of the school, presumably as a diversionary device for the police. Other propane tanks were found in their cars, for use as car bombs.

3. Propane, butane, and LPG container valve connections

   en.wikipedia.org/wiki/Propane,_butane,_and_LPG...

   A 9 kg portable propane tank. A permanent pressure vessel storage tank. ... 1 lb (16 oz) propane bottle (Coleman) 1"-20 CGA600 UNEF 25.4 mm 1.27 mm 1" 20 tpi

4. Columbine High School massacre - Wikipedia

   en.wikipedia.org/wiki/Columbine_High_School_massacre

   They bought six propane tanks on the morning of the attack. [86] Harris was caught on a Texaco gas station security camera at 9:12 a.m. buying a Blue Rhino propane tank. [87] Both cafeteria bombs included a single 20-pound tank, attached pipe bombs, and supporting gasoline canisters alongside. [88]

5. Propane - Wikipedia

   en.wikipedia.org/wiki/Propane

   A 20 lb (9.1 kg) steel propane cylinder. This cylinder is fitted with an overfill prevention device (OPD) valve, as evidenced by the trilobular handwheel. Propane (/ ˈ p r oʊ p eɪ n /) is a three-carbon alkane with the molecular formula C 3 H 8. It is a gas at standard temperature and pressure, but compressible to a transportable liquid.

6. Menards - Wikipedia

   en.wikipedia.org/wiki/Menards

   Menards sold the Menard Building Division in 1994, racking up 36 years in the pole building industry. Menards of East Madison, Wisconsin, pictured in 2012 (closed and relocated to Sun Prairie in 2018) [6] Menards was founded as Menard Cashway Lumber. In the mid-1980s, the "Cashway Lumber" name was dropped and the business became simply known to ...

7. Ordnance QF 20-pounder - Wikipedia

   en.wikipedia.org/wiki/Ordnance_QF_20-pounder

   The Ordnance QF 20 pounder (known as 20 pounder, 20 pdr or simply 20-pr) was a British 84 mm (3.307 inch) tank gun. [ 1 ] [ i ] It was introduced in 1948 and used in the Centurion main battle tank, Charioteer medium tank, and Caernarvon Mark II heavy tank.