A method to indicate the formation of vapors, gases, fumes and the like, to measure the density of such substances or to activate them when there are protective devices or to perform other functions.
ES105110A1
A procedure for the protection of transformers, switches, motors, generators and similar electrical devices.
ES104809A1
A procedure for the protection of transformers, reaction coils, switches, motors, generators and other electrical devices.
ES103278A1
A provision to prevent undue stresses on transformers, switches, generators, motors, cables, busbars and other electrical equipment, the current conducting parts or the material of their insulation.
GB191307391A
Improvements relating to Lock Gates, Sluices and the like.
US1223763A
Lock-gate.
CA291081A
Electrical apparatus protection
CA267004A
Insulating device indicator
CA284124A
Electrical apparatus
CA300277A
Removal of gases from insulated electrical apparatus
