Hole forming device

• US 2,684,518 A
• Filed: 05/07/1951
• Issued: 07/27/1954
• Est. Priority Date: 05/07/1951
• Status: Expired due to Term

• Current Assignee: Whitlock, Leslie A.
• Original Assignee: Whitlock, Leslie A.
• Inventors: Whitlock, Leslie A.
• Application Number:
  US03/224,933
• Time in Patent Office: 1,177 Days
• US Class Current: 249/52
• CPC Class Codes: E04G 15/00 Forms or shutterings for making openings, cavities, slits, or channels forming part of shuttering for walls E04G11/06 , e.g. double walls E04G11/18; prefabricated elements with elements wholly or partly embedded therein B28B23/00; core or mandrels for the prefabrication of concrete elements B28B7/28

Claims