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2. Mathematical formulation of the Standard Model - Wikipedia

   en.wikipedia.org/wiki/Mathematical_formulation...

   For the leptons, the gauge group can be written SU(2) l × U(1) L × U(1) R. The two U(1) factors can be combined into U(1) Y × U(1) l where l is the lepton number . Gauging of the lepton number is ruled out by experiment, leaving only the possible gauge group SU(2) L × U(1) Y .

3. List of the United States Army munitions by supply catalog ...

   en.wikipedia.org/wiki/List_of_the_United_States...

   T1IIT = 330 cartridges .50 linked (2 × API M8, 2 × Incendiary M1, 1 × API-T M20). 55 linked rounds per carton, 1 carton per M10 ammo can, 3 × M10 ammo cans (165 linked rounds) per rectangular cardboard box, 2 vertically-stacked cardboard boxes per Navy metal 20mm Mk.1 Mod.0 ammo box.

4. Scale model - Wikipedia

   en.wikipedia.org/wiki/Scale_model

   Common gauges are 7-1/2" (Western US) and 7-1/4" (Eastern US & rest of the world), 5", and 4-3/4". Smaller live steam gauges do exist, but as the scale gets smaller, pulling power decreases. One of the smallest gauges on which a live steam engine can pull a passenger is the now almost defunct 2 + 1 ⁄ 2 -inch gauge.

5. List of track gauges - Wikipedia

   en.wikipedia.org/wiki/List_of_track_gauges

   The Midwest, until after the Civil War (Ohio gauge) 1,492 mm 4 ft 10 + 3 ⁄ 4 in: Canada Toronto Suburban Railway [39] from 1891–1917. 4 ft 8 + 1 ⁄ 2 in (1,435 mm) until the end at 1931 1,495 mm 4 ft 10 + 7 ⁄ 8 in: Canada Toronto gauge: Halton County Radial Railway, Toronto streetcar system, and Toronto subway (Lines 1, 2, and 4) [39 ...

6. List of rail transport modelling scale standards - Wikipedia

   en.wikipedia.org/wiki/List_of_rail_transport...

   1:22.6. 2. +. 1⁄2 in ( 64 mm) The smallest scale able to pull real passengers. Was one of the first popular live steam gauges, developed in England in the early 1900s. In terms of model railway operation, gauge 3 is the largest (standard gauge) scenic railway modelling scale, using a scale of 13.5 mm to the foot.

7. Rail transport modelling scales - Wikipedia

   en.wikipedia.org/wiki/Rail_transport_modelling...

   1:76.2: 12 mm Narrow-gauge modelling of 3 ft (914 mm) prototypes on 12mm gauge (the same as TT scale) track. EM gauge: 1:76.2: 18.2 mm EM gauge was an earlier attempt in the 1950s to improve the inaccuracies of OO gauge, with wider, more accurate track at 18 mm (0.709 in) between the rails