- catalog Mercury crystal product catalogs are now available. Request your copy. Take advantage of Mercury Advantages today Quick-turn products produced at Mercury USA. Clock oscillators shipped same day VCXO, TCXO, OCXO shipped in 1 ~ 4 weeks Mercury works with you from prototypes to volume. HM series spread spectrum clock oscillators are primarily designed for low EMI. In stead of ...www.mecxtal.com