# Relationship history for MSHA mine 1510906

Current hierarchy: **Fred  Morgenstern; David  Morgenstern → L P Coal Company Inc → L P No 12 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 → L P No 12 Mine; 1974-03-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Great Dane Coal Corp → L P No 12 Mine; 1977-11-01 to 1979-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Rowlette L D → L P No 12 Mine; 1977-11-01 to 1979-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Rowlette L D → Great Dane Coal Corp; 1977-11-01 to 1979-03-08; source msha-controller-operator-history
- **operator_operates_mine:** L P Coal Company Inc → L P No 12 Mine; 1979-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Morgenstern et al → L P Coal Company Inc; 1979-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Morgenstern et al → L P Coal Company Inc; 1979-03-09 to current/open; source msha-controller-operator-history