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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Application No. | Application Title | Issue Date |
| 20090317189 | PROTECTION SYSTEM FOR SURFACES OF INFRASTRUCTURE IMPROVEMENTS IN A CONSTRUCTION ENVIRONMENT A protection system comprises a body section and optional ramps for facilitating travel over the body section. The protection system may comprise base and arm members, which have bottom surfaces at different elevations to fit over an elevation change. In use, the protec... | 12/24/2009 |
| 20060099032 | Support for concrete reinforcing members A structure is described for supporting concrete reinforcement bars in a concrete structure, such as a footer or foundation. The structure includes a base member having a lower surface and an opposing upper surface. A plurality of pairs of opposing first leg members ext... | 05/11/2006 |
