Watson, Cole, Grindle & Watson
Valve stack for high voltages having fire screen means located between valve modules
 A valve stack for high voltages includes a number of electrically interconnected valve modules, some of which are disposed one above the other. To prevent a large fire in a valve module from spreading upwards to valve modules positioned above it, fire screens are arranged between valve modules located one above the other. 
Asea Brown Boveri AB
H
H02M
inventional
Urban Fredrik Mats
Astrom Ruter Johansson