511251

Information

• Patent Grant
• 511251

• References
• Source

• Patent Number

  511,251

• Date Filed

  Not available

• Date Issued

  Tuesday, December 19, 1893
  131 years ago

• CPC

  • A63B21/055 - extension element type
  • A63B21/022 - with springs acting at different parts of the stroke
  • A63B21/04 - attached to static foundation
  • A63B21/154 - using special pulley-assemblies
  • A63B21/023 - Wound springs
  • A63B2208/12 - specially adapted for children
  • Y10T16/64 - Spring

• US Classifications

  • 482 - Exercise devices
  • 005 - Beds
  • 016 - Miscellaneous hardware
  • 267 - Spring devices