| Permit (suffix values) | |
| I = Installation | Note: this letter appears in the 7th digit of the permit number. |
| F = From TMK (for relocation) | |
| T = To TMK (for relocation) | |
| V = Verification |
| Permit (year suffix) | |
| 00 = Permit issued prior to 1973 | Note: this number appears in the last 2 digits of the permit number. |
| 01 = Permit issued after 1973 |
(As of February 17, 1999)