350 Volt, 20 Amp
Package: TO-3
Manufacturer: Solid State Inc (SSI)
Hard to find transistor used for motor control in Williams Hyperball

VCEO = 350 Volts DC Max
IC = 20 Amps DC Max
PD = 175 Watts Max
hFE = 40 min, 400 max at IC = 10A
Vce(sat) = 1.9 Volts DC max at IC = 10A