# Relationship history for MSHA mine 1506798

Current hierarchy: **Fred  Morgenstern; David  Morgenstern → L P Coal Company Inc → No 6 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

- **operator_operates_mine:** Anderson Coal Corp → No 6 Mine; 1973-01-01 to 1974-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Anderson Coal Corp → No 6 Mine; 1973-01-01 to 1974-05-28; source msha-controller-operator-history
- **controller_controls_operator:** Anderson Coal Corp → Anderson Coal Corp; 1973-01-01 to 1974-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Fred  Morgenstern et al → No 6 Mine; 1974-03-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L P Coal Company Inc → No 6 Mine; 1974-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Morgenstern et al → L P Coal Company Inc; 1974-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Morgenstern et al → L P Coal Company Inc; 1974-05-29 to current/open; source msha-controller-operator-history