We welcome your visit. Toledo Engineering Co., Inc. (TECO) is a group of companies with over 80 years of experience serving the worldwide primary glass manufacturing industry. Our home office is located in Toledo, Ohio with sister companies KTG Systems, Inc. (KTGSI), located near Pittsburgh, Pennsylvania and TECOGLAS, Ltd. (TECOGLAS), ZEDTEC, Ltd. (ZEDTEC) and KTG Engineering, Ltd. located in the United Kingdom. See the web pages for the individual companies' addresses, phone numbers and maps & directions to our facilities.