2928643

Information

• Patent Grant
• 2928643

• References
• Source

• Patent Number

  2,928,643

• Date Filed

  Not available

• Date Issued

  Tuesday, March 15, 1960
  64 years ago

• CPC

  • E21D15/588 - the lock also being activated
  • E21D15/306 - by means of a liquid

• US Classifications

  • 248 - Supports