# Relationship history for MSHA mine 1518139

Current hierarchy: **TTI Technologies Inc → Tti Synfuel Operations Inc → Tti Synfuel Operations Inc**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Estill County Processing Llc → Tti Synfuel Operations Inc; 1999-02-01 to 2000-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Charles E  Yates → Tti Synfuel Operations Inc; 1999-02-01 to 2000-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Charles E  Yates → Estill County Processing Llc; 1999-02-01 to 2000-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Tti Synfuel Operations Inc → Tti Synfuel Operations Inc; 2000-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** TTI Technologies Inc → Tti Synfuel Operations Inc; 2000-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** TTI Technologies Inc → Tti Synfuel Operations Inc; 2000-06-01 to current/open; source msha-controller-operator-history