3821521

Information

• Patent Grant
• 3821521

• References
• Source

• Patent Number

  3,821,521

• Date Filed

  Not available

• Date Issued

  Friday, June 28, 1974
  50 years ago

• CPC

  • G06G1/04 - characterised by construction
  • G06G1/00 - Hand manipulated computing devices
  • G06G1/12 - Logarithmic graduations

• US Classifications

  • 235 - Registers