Combination grading tool

• US 2,920,405 A
• Filed: 07/09/1958
• Issued: 01/12/1960
• Est. Priority Date: 07/09/1958
• Status: Expired due to Term

• Current Assignee: Norman Cole
• Original Assignee: Norman Cole
• Inventors: NORMAN COLE
• Application Number:
  US03/747,400
• Time in Patent Office: 552 Days
• US Class Current: 172/142
• CPC Class Codes: A01B 35/30 Undercarriages A01B23/04 takes precedence
• CPC Class Codes: A01B 49/02 with two or more soil-working tools of different kind
• CPC Class Codes: E02F 3/8152 Attachments therefor, e.g. wear resisting parts, cutting edges E02F3/8155, E02F3/8157 take precedence; teeth per se E02F9/28
• CPC Class Codes: E02F 3/8157 Shock absorbers; Supports, e.g. skids, rollers; Devices for compensating wear-and-tear, or the like

Claims