About five years ago, for seven dollars, I bought an old citrus juicer at a thrift shop. It was one of those vintage small appliances which seem built to survive gas explosions and hammer attacks. When I turned on the motor with a metal toggle switch, a drive shaft spun a heavy ceramic knob that gouged out the hearts of lemon and orange halves, leaving not a scrap of pulp uncrushed. The thing worked beautifully, almost like new, so I looked up its serial number on the internet to see when the unit was manufactured, guessing it might be almost 40 years old.