1521137

Information

• Patent Grant
• 1521137

• References
• Source

• Patent Number

  1,521,137

• Date Filed

  Not available

• Date Issued

  Tuesday, December 30, 1924
  100 years ago

• CPC

  • G06M1/068 - with switching means between two or more counting devices

• US Classifications

  • 235 - Registers