# Relationship history for MSHA mine 0101827

Current hierarchy: **North Alabama Coal Mining Company Limited → North Alabama Coal Mining Company Limited → Mine No 1**

- 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 Mining Inc → Mine No 1; 1977-12-01 to 1978-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Dixie Mining Inc → Mine No 1; 1977-12-01 to 1978-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Dixie Mining Inc → Dixie Mining Inc; 1977-12-01 to 1978-05-30; source msha-controller-operator-history
- **operator_operates_mine:** North Alabama Coal Mining Company Limited → Mine No 1; 1978-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** North Alabama Coal Mining Company Limited → Mine No 1; 1978-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** North Alabama Coal Mining Company Limited → North Alabama Coal Mining Company Limited; 1978-05-31 to current/open; source msha-controller-operator-history