| # | Name | Location | Applications |
|---|---|---|---|
| 1. | GT KARBON IZLEME VE ENERJI VERIMLILIGI SANAYI TICARET ANONIM SIRKETI | 🇹🇷 Istanbul, Turkey | 1 |
| 2. | GT KARBON IZLEME VE ENERJI VERIMLILIGI SANAYI TICARET LIMITED SIRKETI | 🇹🇷 Istanbul, Turkey | 1 |
| 3. | GT Knives, Inc. | 🇺🇸 San Diego, CA, United States | 1 |
| 4. | GTK Gewindetechnik Kleymann GmbH & Co. KG | 🇩🇪 Werlte, Germany | 1 |
| 5. | GTK TIMEK GROUP, S.A. | 🇨🇭 Rivera-Monteceneri, Switzerland | 3 |
| 6. | GTK, LLC | 🇺🇸 Albany, GA, United States | 1 |