2188461

Information

• Patent Grant
• 2188461

• References
• Source

• Patent Number

  2,188,461

• Date Filed

  Not available

• Date Issued

  Tuesday, January 30, 1940
  84 years ago

• CPC

  • H04Q1/34 - Impulse regenerators with mechanical or other non-electrical marking arrangements

• US Classifications

  • 375 - Pulse or digital communications
  • 178 - Telegraphy
  • 379 - Telephonic communications