3639988

Information

• Patent Grant
• 3639988

• References
• Source

• Patent Number

  3,639,988

• Date Filed

  Not available

• Date Issued

  Tuesday, February 8, 1972
  52 years ago

• CPC

  • A41H3/002 - Set squares or rulers for drafting patterns

• US Classifications

  • 033 - Geometrical instruments