|
US1533372A
|
|
Loud speaker
|
|
US1538523A
|
|
Gearing for instrument dials
|
|
GB230491A
|
|
Improvements relating to telephone receivers for headsets
|
|
US1526626A
|
|
Electromagnetic sound reproducer
|
|
US1536936A
|
|
Table talker
|
|
US1535734A
|
|
Support for table talkers and method of making the same
|
|
US1543325A
|
|
Headband for telephone head sets
|
|
US1544136A
|
|
Electrical connection for telephone headsets
|
|
US1534373A
|
|
Diaphragm for telephone receivers
|
|
US1486081A
|
|
Sound-producing diaphragm
|
|
US1536486A
|
|
Telephone diaphragm
|
|
GB201810A
|
|
Improvements in apparatus for fixing spool heads on electro magnet cores
|
|
GB202198A
|
|
Improvements in chucks for use in winding wire on the cores of electro-magnets
|
|
GB200785A
|
|
Improvements in tools for the manufacture of telephone receivers and the like
|
|
US1470212A
|
|
Tool for assembling spool heads on electromagnet cores
|
|
US1468625A
|
|
Winding chuck
|
|
US1503973A
|
|
Terminal-setting tool
|
|
US1536482A
|
|
Telephone receiver
|
|
US1447969A
|
|
Telephone head set
|
