# Relationship history for MSHA mine 0100977

Current hierarchy: **Reading & Bates Corp → R B Coal Company → New River Pit No 6**

- 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:** Dixie Coal Company → New River Pit No 6; 1950-01-01 to 1975-12-08; source msha-controller-operator-history
- **controller_controls_mine:** Dixie Coal Company → New River Pit No 6; 1950-01-01 to 1975-12-08; source msha-controller-operator-history
- **controller_controls_operator:** Dixie Coal Company → Dixie Coal Company; 1950-01-01 to 1975-12-08; source msha-controller-operator-history
- **operator_operates_mine:** R B Coal Company → New River Pit No 6; 1975-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Reading & Bates Corp → New River Pit No 6; 1975-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reading & Bates Corp → R B Coal Company; 1975-12-09 to current/open; source msha-controller-operator-history