# Relationship history for MSHA mine 1518228

Current hierarchy: **Roy  Jeffcoat → Energy Conversion Corp → Gobbler No 1**

- 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:** Scott Kembel → Gobbler No 1; 1999-11-01 to 2000-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Kembel → Gobbler No 1; 1999-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Kembel → Scott Kembel; 1999-11-01 to 2000-06-04; source msha-controller-operator-history
- **operator_operates_mine:** Energy Conversion Corp → Gobbler No 1; 2000-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roy  Jeffcoat → Gobbler No 1; 2000-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy  Jeffcoat → Energy Conversion Corp; 2000-06-05 to current/open; source msha-controller-operator-history