# Relationship history for MSHA mine 1502114

Current hierarchy: **Marenko Clifford → Samoyed Energy Company Inc → Prep Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Loftis Coal Company Inc → Prep Plant; 1950-01-01 to 1981-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Loftis W K → Prep Plant; 1950-01-01 to 1981-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Loftis W K → Loftis Coal Company Inc; 1950-01-01 to 1981-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Brinco Ltd → Prep Plant; 1981-01-22 to 1985-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Sharondale Corp → Prep Plant; 1981-03-09 to 1985-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Brinco Ltd → Sharondale Corp; 1981-03-09 to 1985-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Marenko Clifford → Prep Plant; 1981-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Samoyed Energy Company Inc → Prep Plant; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marenko Clifford → Samoyed Energy Company Inc; 1985-02-01 to current/open; source msha-controller-operator-history