|
US2561834A
|
|
Process of regenerating exchangeable filters
|
|
US2598546A
|
|
Electric switch
|
|
US2568377A
|
|
Magnetic switch
|
|
GB651911A
|
|
Improvements in arc-rupturing arrangements in electric circuit-breakers
|
|
GB642628A
|
|
A circuit breaker with magnetic blow-out for alternating current
|
|
GB681985A
|
|
Improvements relating to air-blast switches
|
|
GB644947A
|
|
Improvements in fluid-blast electrical switches
|
|
GB654989A
|
|
A high-frequency oscillation generator using a gas- or vapour-filled discharge tube with controllable time of ignition
|
|
GB643530A
|
|
Multistage supercharger for internal combustion engines
|
