1837638

Information

• Patent Grant
• 1837638

• References
• Source

• Patent Number

  1,837,638

• Date Filed

  Not available

• Date Issued

  Tuesday, December 22, 1931
  93 years ago

• CPC

  • H03J1/045 - Indication of the tuning band, the bandwidth, tone control, the channel number, the frequency, or the like
  • Y10S116/39 - Dial magnifiers

• US Classifications

  • 116 - Signals and indicators
  • 359 - Optical: systems and elements