2550720

Information

• Patent Grant
• 2550720

• References
• Source

• Patent Number

  2,550,720

• Date Filed

  Not available

• Date Issued

  Tuesday, May 1, 1951
  74 years ago

• CPC

  • G01R13/04 - for producing permanent records
  • G01R13/14 - Recording on a light-sensitive material

• US Classifications

  • 324 - Electricity: measuring and testing
  • 084 - Music
  • 174 - Electricity: conductors and insulators