Pick-up tubes adapted for an input of sonic, ultrasonic or mechanical vibrations and having an electric output

Full Title

Cathode ray tubes; Electron beam tubes (H01J25/00, H01J33/00, H01J35/00, H01J37/00 take precedence; details of cathode ray tubes or of electron beam tubes H01J29/00) > having a screen on or from which an image or pattern is formed, picked up, converted, or stored > Pick-up tubes adapted for an input of sonic, ultrasonic or mechanical vibrations and having an electric output