1828733

Information

• Patent Grant
• 1828733

• References
• Source

• Patent Number

  1,828,733

• Date Filed

  Not available

• Date Issued

  Tuesday, October 27, 1931
  93 years ago

• CPC

  • H04M1/647 - using magnetic tape

• US Classifications

  • 379 - Telephonic communications
  • 369 - Dynamic information storage or retrieval