device for selbsttaetigen set of steel a lathe on larger radialabstand of the spin axis during the laengsvorschubs

摘要

Improvements in portable electronic devices to facilitate hearing, characterized by comprising a relatively long and narrow box, curved to fit the curvature of the posterior connection between the pinna and the head, an amplifier, microphone and battery within said housing connected to provide a complete amplifier assembly and an acoustic output transducer connected to said amplifier by flexible conductors penetrating casing adjacent one end thereof.