by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes

Introduced: September 1968

Last revised: January 2006

Full Title

Methods or arrangements for sensing record carriers > by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes

Classification Context

Section:: PHYSICS
Class:: COMPUTING OR CALCULATING; COUNTING
Subclass:: GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS