# Relationship history for MSHA mine 1508469

Current hierarchy: **Dixie Coal Company → Dixie Coal Company → No 1 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:** David  Morgenstern et al → No 1 Mine; 1974-03-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L P Coal Company Inc → No 1 Mine; 1975-06-01 to 1980-08-07; source msha-controller-operator-history
- **controller_controls_operator:** David  Morgenstern et al → L P Coal Company Inc; 1975-06-01 to 1980-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Morgenstern et al → L P Coal Company Inc; 1975-06-01 to 1980-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Dixie Coal Company → No 1 Mine; 1980-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dixie Coal Company → No 1 Mine; 1980-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dixie Coal Company → Dixie Coal Company; 1980-08-08 to current/open; source msha-controller-operator-history