XECO Incorporated inverted mesa crystal blank manufacturer. Crystal blanks for sensor filter and oscillator applications using inverted mesa designs to build high frequncy blanks. The unique inverted mesa crystal blanks mfg approach create defect-free crystals for MHz and GHz applications in oscillator, TCXO VCXO XO filter and biochemical sensor or temperature sensing or physical sensor applications. Some say ZECO but XECO is correct