3686806

Information

• Patent Grant
• 3686806

• References
• Source

• Patent Number

  3,686,806

• Date Filed

  Not available

• Date Issued

  Tuesday, August 29, 1972
  52 years ago

• CPC

  • E04F11/032 - Spiral stairways supported by a central column
  • E04F11/0201 - Space-saving stairways

• US Classifications

  • 052 - Static structures