1548039

Information

• Patent Grant
• 1548039

• References
• Source

• Patent Number

  1,548,039

• Date Filed

  Not available

• Date Issued

  Tuesday, August 4, 1925
  100 years ago

• CPC

  • H03F3/64 - with tubes only

• US Classifications

  • 370 - Multiplex communications
  • 379 - Telephonic communications