1997543

Information

• Patent Grant
• 1997543

• References
• Source

• Patent Number

  1,997,543

• Date Filed

  Not available

• Date Issued

  Tuesday, April 9, 1935
  89 years ago

• CPC

  • B61L7/086 - Common line wire control using relay distributors

• US Classifications

  • 246 - Railway switches and signals