3428252

Information

• Patent Grant
• 3428252

• References
• Source

• Patent Number

  3,428,252

• Date Filed

  Not available

• Date Issued

  Tuesday, February 18, 1969
  55 years ago

• CPC

  • E01B9/18 - for concrete sleepers
  • E01B3/42 - combined with inserts of wood or other material

• US Classifications

  • 238 - Railways: surface track