1937983

Information

• Patent Grant
• 1937983

• References
• Source

• Patent Number

  1,937,983

• Date Filed

  Not available

• Date Issued

  Tuesday, December 5, 1933
  91 years ago

• CPC

  • H04L17/28 - using pneumatic or hydraulic translation

• US Classifications

  • 178 - Telegraphy
  • 234 - Selective cutting
  • 246 - Railway switches and signals
  • 370 - Multiplex communications