3851123

Information

• Patent Grant
• 3851123

• References
• Source

• Patent Number

  3,851,123

• Date Filed

  Not available

• Date Issued

  Tuesday, November 26, 1974
  50 years ago

• CPC

  • H04R1/10 - Earpieces Attachments therefor; Earphones; Monophonic headphones
  • H04R1/1058 - Manufacture or assembly
  • H04R25/60 - Mounting, assembling or interconnection of hearing aid parts
  • H04R1/1016 - Earpieces of the intra-aural type
  • H04R25/04 - comprising pocket amplifiers

• US Classifications

  • 455 - Telecommunications
  • 181 - Acoustics
  • 381 - Electrical audio signal processing systems and devices