CA159477A
|
|
Impulse sending mechanism
|
CA164455A
|
|
Telephone exchange system selector
|
CA156519A
|
|
Switch
|
GB191225174A
|
|
Improvements in Telephone Exchange Systems.
|
GB191319421A
|
|
Improvements in Telephone Exchange Systems.
|
CA162007A
|
|
Telephone switching system
|
GB191123508A
|
|
Improvement in Semi-automatic Telephone Exchange Systems.
|
CA166014A
|
|
Telephone exchange
|
GB191208571A
|
|
Improvements in Manual and Semi-automatic Telephone Exchange Systems.
|
GB191208572A
|
|
Improvements in Automatic or Semi-automatic Telephone Exchange Systems.
|
GB191208573A
|
|
Improvements in Automatic and Semi-automatic Telephone Exchange Systems.
|
GB191117211A
|
|
Improvement in Semi-automatic Telephone Exchange Systems.
|
GB191116867A
|
|
Improvement in Automatic Telephone Exchange Selector.
|
GB191116869A
|
|
Improvements in Automatic and Semi-automatic Telephone Exchange Systems,
|
CA156383A
|
|
Telephone exchange system
|
GB191103452A
|
|
Improvement in Automatic Telephone System Selectors.
|
CA161418A
|
|
Switch for telephone exchanges
|
CA139449A
|
|
Telephone wiring system
|
CA146957A
|
|
Party telephone line
|
CA163004A
|
|
Switch contact
|