# Relationship history for MSHA mine 1512140

Current hierarchy: **Coomes Jimmie → Fort Hartford Coal Company Inc → Ft Hartford Coal**

- 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:** Fort Hartford Coal Company Inc → Ft Hartford Coal; 1979-10-01 to 1980-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Carman Donald C → Ft Hartford Coal; 1979-10-01 to 1980-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Carman Donald C → Fort Hartford Coal Company Inc; 1979-10-01 to 1980-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Fort Hartford Coal Company Inc → Ft Hartford Coal; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coomes Jimmie → Ft Hartford Coal; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coomes Jimmie → Fort Hartford Coal Company Inc; 1980-06-01 to current/open; source msha-controller-operator-history