1818590

Information

• Patent Grant
• 1818590

• References
• Source

• Patent Number

  1,818,590

• Date Filed

  Not available

• Date Issued

  Tuesday, August 11, 1931
  93 years ago

• CPC

  • G04B39/008 - with means for magnified reading
  • G04B19/202 - by means of turning discs

• US Classifications

  • 368 - Horology: time measuring systems or devices
  • 968 - Horology