# Relationship history for MSHA mine 1508953

Current hierarchy: **Fred  Morgenstern; David  Morgenstern → L P Coal Company Inc → No 8 Hignite**

- 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:** Fred  Morgenstern et al → No 8 Hignite; 1974-03-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L P Coal Company Inc → No 8 Hignite; 1975-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Morgenstern et al → L P Coal Company Inc; 1975-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Morgenstern et al → L P Coal Company Inc; 1975-10-18 to current/open; source msha-controller-operator-history