| 2023-03-12 | Some steel beams |
| 2022-05-01 | Parts of many skyscrapers |
| 2020-07-28 | Some building beams |
| 2020-04-08 | Certain building beams |
| 2019-06-30 | Construction girders |
| 2018-07-22 | Some beams |
| 2018-07-08 | Some girders |
| 2014-01-02 | Some support beams |
| 2013-10-05 | Reinforcement pieces |
| 2011-12-19 | Letter-shaped construction pieces |
| 2009-12-12 | Bridge supports |
| 2009-10-18 | Letter-shaped construction pieces |
| 2009-05-06 | Building beams |
| 2008-02-21 | Some beams |
| 2005-12-04 | Certain supports |
| 2005-01-02 | Tower supports |
| 2004-10-10 | Building supports |
| 2003-03-15 | Support group? |
| 2002-09-01 | Struts used in gratings |
| 2001-09-13 | Building supports |
| 2000-12-14 | Building supports |
| 2000-09-30 | Some supporters |
| 2000-04-19 | Bridge-builders' beams |
| 1999-07-18 | Bridge supports |
| 1999-05-30 | Certain girders |