1649180

Information

• Patent Grant
• 1649180

• References
• Source

• Patent Number

  1,649,180

• Date Filed

  Not available

• Date Issued

  Tuesday, November 15, 1927
  97 years ago

• CPC

  • G01R13/12 - Chemical recording

• US Classifications

  • 324 - Electricity: measuring and testing
  • 340 - Communications: electrical
  • 346 - Recorders