Tubes
- Advanced Semiconductor Business, Inc. [PTM Corp.]
- California Tube Laboratory, Inc. [AET, Inc.]
- CORNES DODWELL LTD.
- e2v Technologies PLC. [CORNES DODWELL LTD.]
- L-3 Communications, Electron Devices [Midoriya Electric Co., Ltd.]
- Midoriya Electric Co., Ltd.
- Rikei Corp.
- Xicom Technology, Inc. [Midoriya Electric Co., Ltd.]