# Relationship history for MSHA mine 1507255

Current hierarchy: **Carman Donald C → United Energies Inc → No 1 Surface Mine**

- 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:** United Energies Inc → No 1 Surface Mine; 1974-01-01 to 1976-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Davis James O & Louis Pineur → No 1 Surface Mine; 1974-01-01 to 1976-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Davis James O & Louis Pineur → United Energies Inc; 1974-01-01 to 1976-04-30; source msha-controller-operator-history
- **operator_operates_mine:** United Energies Inc → No 1 Surface Mine; 1976-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carman Donald C → No 1 Surface Mine; 1976-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carman Donald C → United Energies Inc; 1976-05-01 to current/open; source msha-controller-operator-history