2228670

Information

• Patent Grant
• 2228670

• References
• Source

• Patent Number

  2,228,670

• Date Filed

  Not available

• Date Issued

  Tuesday, January 14, 1941
  84 years ago

• CPC

  • G04B39/025 - without special sealing parts
  • E01H2001/1233 - by pressing a tool in the material to be removed

• US Classifications

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