3689970

Information

• Patent Grant
• 3689970

• References
• Source

• Patent Number

  3,689,970

• Date Filed

  Not available

• Date Issued

  Tuesday, September 12, 1972
  52 years ago

• CPC

  • B21D53/74 - frames for openings
  • B21C37/104 - the tubes having a special shape
  • E06B3/2735 - comprising a sheet metal member, an edge or which is bent over the edge of the other metal member with interposition of an insulating element
  • Y10T29/49627 - Frame component
  • Y10T29/49829 - Advancing work to successive stations [i.e., assembly line]
  • Y10T29/5138 - and means to machine work part to fit cooperating work part

• US Classifications

  • 029 - Metal working