2237737

Information

• Patent Grant
• 2237737

• References
• Source

• Patent Number

  2,237,737

• Date Filed

  Not available

• Date Issued

  Tuesday, April 8, 1941
  83 years ago

• CPC

  • G03D13/142 - with a spacing strip

• US Classifications

  • 396 - Photography
  • 242 - Winding, tensioning, or guiding