Descrição At Raltron Electronics, they don't hide the crystal -- they're selling it. The company makes passive electronic components known as crystal filters and crystal oscillators for telecommunications applications such as frequency management, bandpass filtering, and various types of signal synthesis. The parts go into fiber optics network gear, wireless telephone handsets, wireless network equipment, and other electronics. It also makes filters for digital audio broadcasting purposes. Raltron was established in 1983. The company is a subsidiary of Hong Kong-based manufacturer and distributor Rami Technology Group. It operates through 13 subsidiary offices.