# Relationship history for MSHA mine 1202359

Current hierarchy: **Carbontronics Synfuels Investors Lp → Gibson County Synfuel LLC. → Somerville**

- 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

- **controller_controls_mine:** Carbontronics Synfuels Investors Lp → Somerville; 1999-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carbontronics Synfuels Investors Lp → Somerville; 2001-10-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** PC Kentucky Synthetic Fuel #3, LLC → Somerville; 2004-05-04 to 2004-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Carbontronics Synfuels Investors Lp → PC Kentucky Synthetic Fuel #3, LLC; 2004-05-04 to 2004-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Gibson County Synfuel LLC. → Somerville; 2004-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carbontronics Synfuels Investors Lp → Gibson County Synfuel LLC.; 2004-11-17 to current/open; source msha-controller-operator-history