IPC Subgroup
G06K 7/02 by pneumatic or hydraulic means, e.g. sensing punched holes with compressed air; by sonic means
Introduced: September 1968
Last revised: January 2006
Full Title
Methods or arrangements for sensing record carriers > by pneumatic or hydraulic means, e.g. sensing punched holes with compressed air; by sonic means
Classification Context
- Section:
- PHYSICS
- Class:
- COMPUTING OR CALCULATING; COUNTING
- Subclass:
- GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS