3467220

Information

• Patent Grant
• 3467220

• References
• Source

• Patent Number

  3,467,220

• Date Filed

  Not available

• Date Issued

  Tuesday, September 16, 1969
  55 years ago

• CPC

  • E04F11/028 - having a central stringer
  • E04F11/104 - Treads

• US Classifications

  • 182 - Fire escape, ladder, or scaffold
  • 052 - Static structures