1802651

Information

• Patent Grant
• 1802651

• References
• Source

• Patent Number

  1,802,651

• Date Filed

  Not available

• Date Issued

  Tuesday, April 28, 1931
  93 years ago

• CPC

  • B43L13/02 - Draughting machines or drawing devices for keeping parallelism
  • B43K23/001 - Supporting means
  • B43L13/12 - Multiple writing devices

• US Classifications

  • 033 - Geometrical instruments
  • 236 - Automatic temperature and humidity regulation