# Relationship history for MSHA mine 4603493

Current hierarchy: **Carl R  Johnson → C & E Coal Inc → Dickinson Fuel Tract**

- 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:** Saul Construction Inc → Dickinson Fuel Tract; 1950-01-01 to 1976-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Sauls Crever → Dickinson Fuel Tract; 1950-01-01 to 1976-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Sauls Crever → Saul Construction Inc; 1950-01-01 to 1976-09-21; source msha-controller-operator-history
- **operator_operates_mine:** C & E Coal Inc → Dickinson Fuel Tract; 1976-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carl R  Johnson et al → Dickinson Fuel Tract; 1976-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl R  Johnson et al → C & E Coal Inc; 1976-09-22 to current/open; source msha-controller-operator-history