I spoke to a guy once who made gun parts, rifle bits for specific military uses. Their industry is also describable with power laws but at a much slower pace. You toil away selling a handful of units to a narrow group of highly-regulated customers, sometimes for decades, until you get that call to demonstrate your products for someone big (ie the US army). If you win, the next order is for tens of thousands of units. You license/outsource your design for a hundred per unit and walk away with a steady income that will last generations.