37 [ Repair and maintenance services for hand-operated implements, namely, side arms, bayonets, blades, crow bars, knives, harpoons, hunting knives, machetes, penknives, police batons, truncheons, swords, sabres, sword scabbards, sharpening instruments, sharpening steels, sharpening stones, sharpening wheels, firearms including guns, hunting firearms, pistols, revolvers, rifles, air pistols, cannons, artillery guns, ballistic missiles, ballistic weapons, tanks, tear gas weapons, harpoon guns, sporting firearms, machine guns, mortars, motorized weapons, barrels, including, gun barrels and rifle barrels, ammunition and projectiles, cartridges, rockets, signal rockets, shells, explosives, dynamite, explosive powders, gun powder, explosive cartridges, fuses for explosives, lead shot for hunting, apparatus for filling cartridge belts, cartridge cases, gun cases, rifle cases, cleaning brushes for firearms, gun cotton, detonators, sights, other than telescopic sights for guns, noise-suppressors for guns, sighting mirrors for guns and rifles, rocket launchers, shoulder straps for weapons, sprays for personal defense purposes, trigger guards for guns and rifles, gymnastic and sporting articles not included in other classes, archery implements, bows for archery, boxing gloves, camouflage screens, clay pigeon traps, clay pigeons, climbers' harness, decoys for hunting or fishing, discuses for sports, targets, electronic targets, fencing gauntlets, fencing masks, fencing weapons, foils for fencing, fencing gloves, harpoon guns, paintball guns, ammunition for paintball guns, hunting game calls, knee guards, shin guards, elbow guards, punching bags, scale model vehicles, and sling shots ]