1909504

Information

• Patent Grant
• 1909504

• References
• Source

• Patent Number

  1,909,504

• Date Filed

  Not available

• Date Issued

  Tuesday, May 16, 1933
  91 years ago

• CPC

  • G11B15/60 - Guiding record carrier
  • G11B11/18 - with reproducing by optical means

• US Classifications

  • 369 - Dynamic information storage or retrieval
  • 226 - Advancing material of indeterminate length
  • G9B - INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER