1824724

Information

• Patent Grant
• 1824724

• References
• Source

• Patent Number

  1,824,724

• Date Filed

  Not available

• Date Issued

  Tuesday, September 22, 1931
  93 years ago

• CPC

  • E21F15/06 - Filling-up mechanically
  • H04R7/14 - corrugated, pleated or ribbed
  • H04R7/20 - Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
  • H04R11/00 - Transducers of moving-armature or moving-core type

• US Classifications

  • 381 - Electrical audio signal processing systems and devices
  • 324 - Electricity: measuring and testing