| # | Entity | Status | State |
|---|---|---|---|
| 1 | 18 000 822 720 WILLIAMSON ENGINEERING PTY. LIMITED |
ABN Active | NSW 2170 |
| 2 | 36 053 150 048 JOHN WILLIAMSON ENGINEERS PTY LTD |
ABN Active | SA 5241 |
| 3 | 14 203 917 134 REGINALD WILLIAMSON REG WILLIAMSON ENGINEERING SERVICES |
ABN Cancelled | NSW 2232 |
| 4 | 18 000 822 720 WILLIAMSON ENGINEERING PTY. LIMITED WILLIAMSON ENGINEERING |
ABN Active | NSW 2170 |
| 5 | 22 345 741 825 SCOTT DOUGLAS WILLIAMSON WILLIAMSON CIVIL ENGINEERING CONSULTING |
ABN Active | QLD 4300 |
| 6 | 25 102 128 344 MARK WILLIAMSON MARK WILLIAMSON SMALL ENGINE AND GENERAL REPAIRS |
ABN Active | WA 6728 |
| 7 | 31 000 179 260 BILLET BOSS PTY LIMITED WILLIAMSON TOOL AND ENGINEERING |
ABN Active | NSW 2170 |
| 8 | 37 140 680 677 JOHN PALMER WILLIAMSON JOHN WILLIAMSON ENGINEERING SERVICES |
ABN Cancelled | VIC 3350 |
| 9 | 13 093 796 242 DCL ENGINEERING PTY LIMITED Williamson Tool & Engineering |
ABN Active | NSW 2165 |