| # | Entity | Status | State |
|---|---|---|---|
| 1 | 19 065 174 076 TONKIN ENGINEERING PTY. LTD. |
ABN Active | SA 5341 |
| 2 | 29 123 977 766 TONKIN ENGINEERS PTY LTD |
ABN Cancelled | NSW 2327 |
| 3 | 34 120 564 794 Tonkin Engineering (VIC) Pty Ltd |
ABN Active | VIC 3551 |
| 4 | 19 065 174 076 TONKIN ENGINEERING PTY. LTD. TONKIN ENGINEERING PTY LTD |
ABN Active | SA 5341 |
| 5 | 21 047 315 902 IAN TONKIN Tonkin Engineering |
ABN Cancelled | VIC 3024 |
| 6 | 44 851 801 768 LINDSAY JOSEPH TONKIN LINDSAY TONKIN ENGINEERING |
ABN Active | SA 5047 |
| 7 | 99 630 962 951 T & R UNIT TRUST FUND TONKIN CONSULTING ENGINEERING & SERVICES |
ABN Active | SA 5067 |