
Philips Electronics
N-channel dual-gate MOS-FET

Siemens AG
Silicon N Channel MOSFET Tetrode

Temic Semiconductors
N-Channel Dual Gate MOS-Fieldeffect Tetrode, Depletion Mode

Vishay Semiconductors
N–Channel Dual Gate MOS-Fieldeffect Tetrode, Depletion Mode

NXP Semiconductors.
N-channel dual-gate MOS-FET

Infineon Technologies
Silicon N Channel MOSFET Tetrode