3901174

Information

• Patent Grant
• 3901174

• References
• Source

• Patent Number

  3,901,174

• Date Filed

  Not available

• Date Issued

  Tuesday, August 26, 1975
  49 years ago

• CPC

  • B21D39/02 - of sheet metal by folding
  • B21C37/101 - Making of the seams
  • B21C37/104 - the tubes having a special shape

• US Classifications

  • 072 - Metal deforming