1642822

Information

• Patent Grant
• 1642822

• References
• Source

• Patent Number

  1,642,822

• Date Filed

  Not available

• Date Issued

  Tuesday, September 20, 1927
  97 years ago

• CPC

  • H04M1/34 - Lost-motion or other arrangements for ensuring a pause between successive digit transmissions

• US Classifications

  • 379 - Telephonic communications