Herman Joseph

Telegraph repeater circuits

Radio telephone and telegraph system

Phase regulator for multifrequency generators

Means for measuring time of propagation of wave fronts over circuits

Start-stop telegraph repeater

Method of and means for measuring time of propagation of wave fronts over circuits

Automatic volume control for telephone lines

Method of and apparatus for synchronization in picture transmission

Relay and circuits therefor

Automatic line level regulation of multiple channel television systems