3813658

Information

• Patent Grant
• 3813658

• References
• Source

• Patent Number

  3,813,658

• Date Filed

  Not available

• Date Issued

  Tuesday, May 28, 1974
  50 years ago

• CPC

  • B61L25/043 - using inductive tags
  • B61L25/046 - using magnetic tags
  • G06F3/0224 - Key guide holders
  • G06F3/0238 - Programmable keyboards

• US Classifications

  • 235 - Registers