2421781

Information

• Patent Grant
• 2421781

• References
• Source

• Patent Number

  2,421,781

• Date Filed

  Not available

• Date Issued

  Tuesday, June 10, 1947
  77 years ago

• CPC

  • G04D7/1221 - with recording
  • G04D7/1228 - Devices for facilitating the reading or the interpretation of the recording

• US Classifications

  • 346 - Recorders
  • 073 - Measuring and testing
  • 968 - Horology