1930275

Information

• Patent Grant
• 1930275

• References
• Source

• Patent Number

  1,930,275

• Date Filed

  Not available

• Date Issued

  Tuesday, October 10, 1933
  91 years ago

• CPC

  • H04M5/02 - Constructional details

• US Classifications

  • 379 - Telephonic communications
  • 361 - Electricity: electrical systems and devices