3919503

Information

• Patent Grant
• 3919503

• References
• Source

• Patent Number

  3,919,503

• Date Filed

  Not available

• Date Issued

  Tuesday, November 11, 1975
  49 years ago

• CPC

  • H04Q1/145 - with switches arranged in a matrix configuration
  • H04Q1/147 - using robots for distributing

• US Classifications

  • 324 - Electricity: measuring and testing
  • 379 - Telephonic communications