TBO definitions

Tbo

1) Time between overhauls
Found on https://www.crosswordclues.com/clue/tbo

---

TBO

Time Between Overhauls.
Found on http://www.encyclo.co.uk/visitor-contributions.php

---

TBO

Time Between Overhauls
Found on http://www.tornado-data.com/siteinfo/glossary.htm

---