2557521

Information

• Patent Grant
• 2557521

• References
• Source

• Patent Number

  2,557,521

• Date Filed

  Not available

• Date Issued

  Tuesday, June 19, 1951
  73 years ago

• CPC

  • B42F13/0033 - with two or more filing appliances

• US Classifications

  • 281 - Books, strips, and leaves