Most of us buy used guitars and between Fender poorly marking pickups, other companies making 'replicas', a few faked clones sold as real, owners building their own pickups from kits, and general pickup-swapping tone-chasing adventures we expect the pickups have been messed with and the usual details get revealed by looking at the backs of the pickups and the wiring.
As of January 2015, Exxon Mobil is the largest producer of natural gas in the United States at 3,415 million cubic feet per day, according to the Natural Gas Supply Association. Next is Chesapeake Energy at 2,979 million cubic feet per day, followed by Anadarko and Southwestern Energy Co.
However, the top natural gas producers in the United States are really a mix of integrated multinational companies, who produce both oil and gas around the world, and much smaller independent companies that specialize in oil drilling or gas production, as reported by Pro Publica. Many are Fortune 500 companies.