1809828

Information

• Patent Grant
• 1809828

• References
• Source

• Patent Number

  1,809,828

• Date Filed

  Not available

• Date Issued

  Tuesday, June 16, 1931
  93 years ago

• CPC

  • H04B3/144 - fixed equalizers

• US Classifications

  • 379 - Telephonic communications
  • 178 - Telegraphy
  • 333 - Wave transmission lines and networks
  • 381 - Electrical audio signal processing systems and devices