Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Amalgamated Engineering Union
Table title:
General Secretaries
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Construction </th><th colspan=1 rowspan=1 > Engineering </th><th colspan=1 rowspan=1 > Foundry </th><th colspan=1 rowspan=1 > TASS </th></tr>
<tr> <td colspan=1 rowspan=1 > 1968 </td><td colspan=1 rowspan=1 > Created 1971 </td><td colspan=1 rowspan=3 > Jim Conway </td><td colspan=1 rowspan=2 > William Simpson </td><td colspan=1 rowspan=1 > Created 1971 </td></tr>
<tr> <td colspan=1 rowspan=1 > 1971 </td><td colspan=1 rowspan=3 > Eddie Marsden </td><td colspan=1 rowspan=1 > George Doughty </td></tr>
<tr> <td colspan=1 rowspan=1 > 1974 </td><td colspan=1 rowspan=4 > Bob Garland </td><td class="highlighted"  colspan=1 rowspan=5 > Ken Gill </td></tr>
<tr> <td colspan=1 rowspan=1 > 1975 </td><td colspan=1 rowspan=2 > John Boyd </td></tr>
<tr> <td colspan=1 rowspan=1 > 1976 </td><td colspan=1 rowspan=2 > John Baldwin </td></tr>
<tr> <td colspan=1 rowspan=1 > 1982 </td><td colspan=1 rowspan=1 > Gavin Laird </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1984 </td><td class="highlighted"  colspan=3 rowspan=1 > Gavin Laird </td></tr>
</table>
Question:
Who was the person that constructed the building?
Answer:
In 1984, the Engineering, Foundry and Construction Sections were merged, while the TASS remained separate.