Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04Q—SELECTING
  • H04Q1/00—Details of selecting apparatus or arrangements
  • H04Q1/18—Electrical details
  • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
  • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of DC pulses
  • H04Q1/34—Impulse regenerators with mechanical or other non-electrical marking arrangements
• • G—PHYSICS
  • G06—COMPUTING OR CALCULATING; COUNTING
  • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
  • G06K21/00—Information retrieval from punched cards designed for manual use or handling by machine; Apparatus for handling such cards, e.g. marking or correcting
  • G06K21/04—Information retrieval from punched cards designed for manual use or handling by machine; Apparatus for handling such cards, e.g. marking or correcting in which coincidence of markings is sensed optically, e.g. peek-a-boo system

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Theoretical Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=25131115

Family Applications (3)

Family Applications Before (1)

Family Applications After (1)

Country Status (3)

• 0
  • NL NL141509D patent/NL141509C/xx active
  • NL NL146647D patent/NL146647C/xx active
  • NL NL72142D patent/NL72142C/xx active
  • BE BE484699D patent/BE484699A/xx unknown
• 1948
  • 1948-07-13 FR FR969165D patent/FR969165A/fr not_active Expired

Also Published As

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