F45 Depression position finder, Lewis, M1907 – Parts and equipment. F43 Sight, M1912, 2.95-inch mountain gun – Parts and equipment. F42 Mount, telescope, M2 (for 75mm mortar carriage, M1) Telescope, elbow, M3 (for 75mm mortar carriage, M1) – Parts and equipment. F41 Periscope, Battery Commanders, M1918. F40 Level, testing – Parts and equipment. F37 Clinometer, MK.1, (degrees) 3-inch, trench mortar. F36 Pocket watch, 7-Jewel, 15-Jewel, and stop watch Type B, class 15. 
(for 37-mm tank gun, and machine gun,) (M2 Light Tank?)
F31 Sight, M1916, telescopic, 37mm gun, M1916 – Parts and equipment, 18 October 1926. F30 Sight, telescopic, 2.24-inch (6 Pdr.) tank gun, Mk.II (British) -Parts and equipment. F29 Sight, M1916, for 75 mm Gun M1916 – Parts and equipment. F27 Sights, rocking-bar (all types) – Parts and equipment. base, M1918 -Parts and equipment, 7 December 1926 F22 Telescope, Panoramic, M1917M1 (Mils). F21 Kit, repair optical, for field artillery equipment. F18 Night lighting device, parts and equipment. F17 Device, aiming, mirror, M1918 – Parts and equipment, 23 November 1926. F16 Sight, panoramic, machine gun, M1918 – Parts and equipment. F15 Machine gun clinometer M1917 Parts and equipment. 
F14 Compass, lensatic, M1918 – Parts and equipment, 16 September 1927.F12 Targets, testing (small arms and field artillery) – parts.
F10 bore sight, (small arms, and field artillery). F8 Mount, telescope, M1 (for 37mm gun carriage, M1) Telescope, M2 (for 37mm gun carriage, M1) – Parts and equipment. F5 Items common to two or more group F products. F4 Rule, slide, M1917 – Parts and equipment. F3 Items not authorized for general issue. F2 Major items, harbor defense, railway, and antiaircraft artillery sighting equipment, and fire-control instruments. F1 Major items, small arms, automatic gun, trench mortar, and field artillery sighting equipment, and fire control instruments. American soldiers using a Coincidence rangefinder with its distinctive single eyepiece during Army maneuvers in the 1940s.
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