2815402

Information

• Patent Grant
• 2815402

• References
• Source

• Patent Number

  2,815,402

• Date Filed

  Not available

• Date Issued

  Tuesday, December 3, 1957
  67 years ago

• CPC

  • H04Q1/34 - Impulse regenerators with mechanical or other non-electrical marking arrangements
  • H04M1/272 - with provision for storing only one subscriber number at a time

• US Classifications

  • 365 - Static information storage and retrieval
  • 379 - Telephonic communications