1542970

Information

• Patent Grant
• 1542970

• References
• Source

• Patent Number

  1,542,970

• Date Filed

  Not available

• Date Issued

  Tuesday, June 23, 1925
  99 years ago

• CPC

  • G01N21/293 - with colour charts, graduated scales or turrets
  • F41A23/22 - on board of submarines

• US Classifications

  • 089 - Ordnance