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GB215456A
|
|
Improvements in or relating to telephone-receivers
|
|
GB188744A
|
|
Improvements in or relating to mine-rescue and like telephone apparatus
|
|
GB176831A
|
|
Improvements in or relating to diaphragms and the like for telephone transmitters
|
|
GB172780A
|
|
Improvements in or relating to telephone transmitters
|
|
GB164421A
|
|
Improvements in or relating to telephones
|
|
GB164790A
|
|
Improvements in or relating to telephones
|
|
GB160243A
|
|
Improvements in or relating to telephones
|
|
GB158978A
|
|
Improvements in or relating to telephone receivers and ear-pieces therefor
|
|
GB152107A
|
|
Improvements in or relating to intercommunication telephones
|
|
GB151336A
|
|
Improvements in or relating to telephones
|
|
GB151335A
|
|
Improvements in or relating to telephones
|
|
GB139972A
|
|
Improvements in or relating to electric switches
|
|
GB150404A
|
|
Improvements in or relating to switch contacts for multiple electric switches
|
|
GB146590A
|
|
Improvements in or relating to station telephone sets for intercommunication telephone systems
|
|
GB146589A
|
|
Improvements in or relating to station sets for intercommunication telephones
|
|
GB146591A
|
|
Improvements in or relating to driving mechanism for the selectorarm of automatic selector-switches
|
