# Relationship history for MSHA mine 4403671

Current hierarchy: **Merritt Jerry L → Farwest Coal Company → No 12**

- 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:** Potter John-Kenneth & David → No 12; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ratliff Arthur M Jr → No 12; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Merritt Jerry L → No 12; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dilston Mining Corp → No 12; 1974-01-01 to 1976-09-20; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff Arthur M Jr → Dilston Mining Corp; 1974-01-01 to 1976-09-20; source msha-controller-operator-history
- **controller_controls_mine:** Gulf + Western Industries Inc & Raven Smokeless Co → No 12; 1976-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Raven Anchor Smokeless Coal Company → No 12; 1976-09-21 to 1978-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Gulf + Western Industries Inc & Raven Smokeless Co → Raven Anchor Smokeless Coal Company; 1976-09-21 to 1978-06-11; source msha-controller-operator-history
- **operator_operates_mine:** Edd Potter Coal Company → No 12; 1978-06-12 to 1979-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Potter John-Kenneth & David → Edd Potter Coal Company; 1978-06-12 to 1979-07-09; source msha-controller-operator-history
- **operator_operates_mine:** W L Hopkins Coal Company → No 12; 1979-07-10 to 1980-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Hopkins Willard L → No 12; 1979-07-10 to 1980-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Hopkins Willard L → W L Hopkins Coal Company; 1979-07-10 to 1980-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Farwest Coal Company → No 12; 1980-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Merritt Jerry L → Farwest Coal Company; 1980-04-15 to current/open; source msha-controller-operator-history