Double pole membrane switch having preferred sequence closing fe

Double-acting, compressed gas, high tension circuit breaker with

Double-break puffer-type compressed-gas circuit-breaker

Double-domed elastomeric keyboard element

Double-flow puffer-type compressed-gas circuit-interrupter

Double-flow puffer-type single-pressure compressed-gas circuit-i

Double-pole single-throw switch

Double-puffer-type compressed-gas circuit-interrupter constructi

Downstream injection nozzle for puffer circuit interrupter

Drive for a high-tension circuit breaker

Drive for high speed disconnect switch

Driving apparatus for electric power circuit breakers

Driving arrangement for electrical switches with an independent

Driving mechanism for switching apparatus with pressure contacts

Driving mechanisms for vacuum circuit breakers

Dual arcing contacts for circuit breaker

Dual compression puffer interrupter

Dual spring circuit interrupter apparatus

Dual switch operator using modified Geneva movement

Dual-compression gas-blast puffer-type interrupting device