1987680

Information

• Patent Grant
• 1987680

• References
• Source

• Patent Number

  1,987,680

• Date Filed

  Not available

• Date Issued

  Tuesday, January 15, 1935
  89 years ago

• CPC

  • G01C19/40 - for control by signals from a master compass

• US Classifications

  • 340 - Communications: electrical
  • 367 - Communications, electrical: acoustic wave systems and devices