1397547

Information

• Patent Grant
• 1397547

• References
• Source

• Patent Number

  1,397,547

• Date Filed

  Not available

• Date Issued

  Tuesday, November 22, 1921
  103 years ago

• CPC

  • G01G23/28 - involving auxiliary or memory marks

• US Classifications

  • 116 - Signals and indicators
  • 235 - Registers