3020642

Information

• Patent Grant
• 3020642

• References
• Source

• Patent Number

  3,020,642

• Date Filed

  Not available

• Date Issued

  Tuesday, February 13, 1962
  64 years ago

• CPC

  • B43L13/043 - with squares

• US Classifications

  • 033 - Geometrical instruments
  • 048 - Gas: heating and illuminating