1672821

Information

• Patent Grant
• 1672821

• References
• Source

• Patent Number

  1,672,821

• Date Filed

  Not available

• Date Issued

  Tuesday, June 5, 1928
  96 years ago

• CPC

  • H01B11/143 - using helically wound magnetic tape

• US Classifications

  • 178 - Telegraphy
  • 174 - Electricity: conductors and insulators
  • 427 - Coating processes