The LGL Group , Inc . , through its wholly owned subsidiary MtronPTI , manufactures and markets highly engineered electronic components used to control the frequency or timing of signals in electronic circuits . � � These devices are used extensively in infrastructure equipment for the telecommunications and network equipment industries . � � They are also used in electronic systems for military applications , avionics , earth-orbiting satellites , medical devices , instrumentation , industrial devices and global positioning systems . � � The Company has operations in Orlando , Florida , Yankton , South Dakota and Noida , India . � � MtronPTI also has a sales office in Hong Kong , China .