2252549

Information

• Patent Grant
• 2252549

• References
• Source

• Patent Number

  2,252,549

• Date Filed

  Not available

• Date Issued

  Tuesday, August 12, 1941
  82 years ago

• CPC

  • H04M9/001 - Two-way communication systems between a limited number of parties
  • H04M19/06 - Current supply source at subordinate switching centre charged from main exchange

• US Classifications

  • 379 - Telephonic communications