1770978

Information

• Patent Grant
• 1770978

• References
• Source

• Patent Number

  1,770,978

• Date Filed

  Not available

• Date Issued

  Tuesday, July 22, 1930
  94 years ago

• CPC

  • E21D15/38 - with longitudinally-divided upper or lower prop parts

• US Classifications

  • 248 - Supports