3914889

Information

• Patent Grant
• 3914889

• References
• Source

• Patent Number

  3,914,889

• Date Filed

  Not available

• Date Issued

  Tuesday, October 28, 1975
  48 years ago

• CPC

  • G06G1/0068 - for conversion from one unit system to another

• US Classifications

  • 040 - Card, picture, or sign exhibiting
  • 235 - Registers
  • 434 - Education and demonstration