|
US829849A
|
|
Telephone or like transmitter.
|
|
CA98237A
|
|
Telephone transmitter
|
|
GB190505149A
|
|
Improvements in or relating to Telephone and like Transmitters.
|
|
GB190205125A
|
|
Improvements in or relating to Signalling Apparatus, particularly applicable for Motor Cars and the like
|
|
US675467A
|
|
Telephone speaking-tube or like receiver.
|
|
GB189918040A
|
|
Improvements in or relating to Telephone, Speaking Tube, and like Receivers.
|
|
GB189917253A
|
|
Improvements in Water-tight Connections for Speaking and other Tubes or Pipes.
|
|
GB189610021A
|
|
Improvements in or relating to Speaking Tubes or Voice Pipes.
|
|
GB189409265A
|
|
Improvements in Water-tight Connections for Speaking and other Tubes or Pipes.
|
|
GB189323885A
|
|
Improvements in or relating to Speaking Tubes.
|
|
GB189323501A
|
|
Improvements in Indicating Devices for Speaking Tubes.
|
