1989137

Information

• Patent Grant
• 1989137

• References
• Source

• Patent Number

  1,989,137

• Date Filed

  Not available

• Date Issued

  Tuesday, January 29, 1935
  90 years ago

• CPC

  • E05B35/12 - requiring the use of two keys
  • Y10S70/16 - Jail door lock
  • Y10T70/7458 - Interdependent

• US Classifications

  • 070 - Locks