1978825

Information

• Patent Grant
• 1978825

• References
• Source

• Patent Number

  1,978,825

• Date Filed

  Not available

• Date Issued

  Tuesday, October 30, 1934
  91 years ago

• CPC

  • G04B39/004 - from a material other than glass

• US Classifications

  • 368 - Horology: time measuring systems or devices
  • 968 - Horology
  • D25 - Building units and construction elements