1850929

Information

• Patent Grant
• 1850929

• References
• Source

• Patent Number

  1,850,929

• Date Filed

  Not available

• Date Issued

  Tuesday, March 22, 1932
  93 years ago

• CPC

  • B44C1/224 - manually
  • B44C1/225 - by engraving

• US Classifications

  • 216 - Etching a substrate: processes