Willian Brinks Hofer Gilson & Lione
Instrument for producing harmonics-free periodic signals
 An instrument for obtaining harmonics-free signals with the aid of a periodic measurement graduation and a nonperiodic scanning graduation, wherein the centers of scanning graduation markings are staggered in accordance with a modified arcsin function. 
Dr. Johanness Heidenhain GmbH
G G
G01D G01D
inventional inventional
Wolfgang
Holzapfel