1697811

Information

• Patent Grant
• 1697811

• References
• Source

• Patent Number

  1,697,811

• Date Filed

  Not available

• Date Issued

  Tuesday, January 1, 1929
  96 years ago

• CPC

  • C21D1/54 - Determining when the hardening temperature has been reached by measurement of magnetic or electrical properties

• US Classifications

  • 266 - Metallurgical apparatus
  • 219 - Electric heating
  • 432 - Heating