1997299

Information

• Patent Grant
• 1997299

• References
• Source

• Patent Number

  1,997,299

• Date Filed

  Not available

• Date Issued

  Tuesday, April 9, 1935
  89 years ago

• CPC

  • B61C9/24 - electric

• US Classifications

  • 105 - Railway rolling stock
  • 454 - Ventilation