For buy-and-hold investors, success is found in diverse companies that can produce year after year.Technology may change the industrial factory, but the basic need to produce goods and services will never disappear. Investors have tons of options in this area. Do you want a diversified conglomerate? Companies like Honeywell International (HON -0.23%) and Illinois Tool Works (ITW -1.02%) have you covered. Want to invest in aviation and the technology defending the U.S. and its allies? Consider RTX (RTX -0.02 ...