3687557

Information

• Patent Grant
• 3687557

• References
• Source

• Patent Number

  3,687,557

• Date Filed

  Not available

• Date Issued

  Tuesday, August 29, 1972
  52 years ago

• CPC

  • H02G1/1258 - not using wire or cable-clamping means
  • G02B21/0016 - Technical microscopes
  • Y10T29/49769 - Using optical instrument [excludes mere human eyeballing]

• US Classifications

  • 356 - Optics: measuring and testing
  • 029 - Metal working