Apparatus or tools adapted for slotting or otherwise marking information-retrieval cards

Full Title

Information retrieval from punched cards designed for manual use or handling by machine; Apparatus for handling such cards, e.g. marking or correcting > Apparatus or tools adapted for slotting or otherwise marking information-retrieval cards

Classification Context

Section:

PHYSICS

Class:

COMPUTING OR CALCULATING; COUNTING

Subclass:

GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS