The part that interested me the most was the crystal oscillator (22). It is more accurately referred to as a piezoelectric resonator. It is marked ECEC for the manufacturer: the East Crystal Electronic Company and also marked 13.824H1. The 13.824H1 indicates the frequency. A crystal oscillator uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a very precise frequency. Crystal oscillators contain a wafer of synthetic quartz crystal and trace amounts of silver and gold.