Crystal oscillators.
Electronic components like semi conductors, integrated circuits, capacitors, inductors, diodes and triodes, discrete semiconductors, rf/if and rfid, analog devices, transistors, memory, microprocessors, resistors, switches, relays, connectors, circuit protection, potentiometers, coils, chokes, transformers, magnetic components, insulators, crystals, oscillators, resonators, interconnect devices, sensors, emitters, opto electronic power supplies and more. .