Patents Assigned to Holywell Engineering Limited
  • Patent number: 4382721
    Abstract: A mine roadway support stilt includes, on two opposing faces thereof, a plurality of deformable, longitudinally extending indentations and, on the remaining faces, additional indentations to inhibit improper insertion of the I-beam joist support normally received in said stilt.
    Type: Grant
    Filed: July 1, 1981
    Date of Patent: May 10, 1983
    Assignee: Holywell Engineering Limited
    Inventor: Norman S. King