2307646

Information

• Patent Grant
• 2307646

• References
• Source

• Patent Number

  2,307,646

• Date Filed

  Not available

• Date Issued

  Tuesday, January 5, 1943
  82 years ago

• CPC

  • G03B41/026 - combined with slit

• US Classifications

  • 396 - Photography
  • 324 - Electricity: measuring and testing