by means which conduct current when a mark is sensed or absent, e.g. contact brush for a conductive mark

Introduced: September 1968

Last revised: January 2006

Full Title

Methods or arrangements for sensing record carriers > by means which conduct current when a mark is sensed or absent, e.g. contact brush for a conductive mark

Classification Context

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