Drilling rigs; rock drills; earth drilling machines; earth drilling machine parts and accessories therefor, namely, core barrels, drill rods, drill pipe, drill tubing, drill rod shank adapter, drill rod couplers, overshots, drill bits, reaming shells, water swivels, hoisting plugs, drill casings, drill casing cutters, casing shoes, casing bits, deflection wedges, wireline loading chambers, pneumatic feedleg for rock drills, taps for drill rods, taps for drill casings, taps for outer tubes; earth drilling machine parts and accessories therefor, namely, adapters for drill rods, adapters for water swivels, adapters for hoisting plugs, adapters for drill casings, and adapters for recovery taps; earth drilling machine parts and accessories therefor, namely, core barrel conversion kits comprised of shut-off valves, landing shoulders, pump-in seal, core lifters, core lifter cases, latches, and inner tube caps; earth drilling machine parts and accessories therefor, namely, conversion kits for overshots comprised of a spring pin fastener and spacer for use in converting overshots to dry hole lowering applications