Investors are enjoying the ongoing bull run. The S&P 500 and Nasdaq Composite recently hit all-time highs. Though that's pretty exciting, bull markets don't last forever. Equities that can perform well in good times are great. Those that can perform well over the long run, through bull and bear markets, economic peaks and lows, are even better.Let's look at two excellent stocks that ought to deliver solid returns well beyond the current bull market: Medtronic (MDT 0.31%) and Merck (MRK -0.03%).1. MedtronicM ...