2973421

Information

• Patent Grant
• 2973421

• References
• Source

• Patent Number

  2,973,421

• Date Filed

  Not available

• Date Issued

  Tuesday, February 28, 1961
  63 years ago

• CPC

  • D06H1/003 - by passing a needle through the layers

• US Classifications

  • 219 - Electric heating
  • 101 - Printing