# Relationship history for MSHA mine 1507213

Current hierarchy: **Consumers Coal Company → Kentucky Prince Coal Corp → No 1 Surface**

- 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:** Consumers Coal Company → No 1 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coal Power Inc → No 1 Surface; 1974-01-01 to 1977-10-19; source msha-controller-operator-history
- **controller_controls_mine:** Price Robert T → No 1 Surface; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Price Robert T → Coal Power Inc; 1974-01-01 to 1977-10-19; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Prince Coal Corp → No 1 Surface; 1977-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Consumers Coal Company → Kentucky Prince Coal Corp; 1977-10-20 to current/open; source msha-controller-operator-history