3872478

Information

• Patent Grant
• 3872478

• References
• Source

• Patent Number

  3,872,478

• Date Filed

  Not available

• Date Issued

  Tuesday, March 18, 1975
  50 years ago

• CPC

  • G01V1/242 - Seismographs

• US Classifications

  • 346 - Recorders
  • 073 - Measuring and testing
  • 367 - Communications, electrical: acoustic wave systems and devices