3645441

Information

• Patent Grant
• 3645441

• References
• Source

• Patent Number

  3,645,441

• Date Filed

  Not available

• Date Issued

  Tuesday, February 29, 1972
  52 years ago

• CPC

  • G06F15/0225 - User interface arrangements
  • G06F3/0238 - Programmable keyboards
  • H03M11/00 - Coding in connection with keyboards or like devices
  • H03M11/14 - by using additional keys

• US Classifications

  • 235 - Registers