In October 2004, Piezo Technology Inc was acquired by MtronPTI. in an all cash transaction. Piezo Technology, Inc. (PTI) provides advanced frequency control products -- temperature-compensated crystal oscillators (TCXOs), SC-cut and AT-cut ovenized crystal oscillators (OCXOs), monolithic crystal filters, discrete crystal filters, miniaturized L-C filters,SC-cut and AT-cut resonators, and r-f subassemblies