# Relationship history for MSHA mine 0102999

Current hierarchy: **Powell Greg → P B Coal Inc → Frost Creek 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

- **controller_controls_mine:** Brown Gene → Frost Creek Mine; 1993-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southern Coal Resources Inc → Frost Creek Mine; 1993-09-01 to 1994-07-19; source msha-controller-operator-history
- **controller_controls_mine:** Van Andel Lambert Jay Sr → Frost Creek Mine; 1993-09-01 to 1994-07-19; source msha-controller-operator-history
- **controller_controls_operator:** Van Andel Lambert Jay Sr → Southern Coal Resources Inc; 1993-09-01 to 1994-07-19; source msha-controller-operator-history
- **operator_operates_mine:** Bar Coal Inc → Frost Creek Mine; 1994-07-20 to 1995-01-22; source msha-controller-operator-history
- **controller_controls_operator:** Brown Gene → Bar Coal Inc; 1994-07-20 to 1995-01-22; source msha-controller-operator-history
- **controller_controls_mine:** Powell Greg → Frost Creek Mine; 1994-10-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P B Coal Inc → Frost Creek Mine; 1995-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Powell Greg → P B Coal Inc; 1995-01-23 to current/open; source msha-controller-operator-history