# Relationship history for MSHA mine 1512818

Current hierarchy: **Shackelford Dallas & Moore Clyde W → White Oak Coal Corp → Co-Op No 2 Strip**

- 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 → Co-Op No 2 Strip; 1981-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Co-Op Reserve Corp → Co-Op No 2 Strip; 1981-04-01 to 1983-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Morgenstern et al → Co-Op Reserve Corp; 1981-04-01 to 1983-03-01; source msha-controller-operator-history
- **controller_controls_operator:** David  Morgenstern et al → Co-Op Reserve Corp; 1981-04-01 to 1983-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Shackelford Dallas & Moore Clyde W → Co-Op No 2 Strip; 1983-02-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** White Oak Coal Corp → Co-Op No 2 Strip; 1983-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shackelford Dallas & Moore Clyde W → White Oak Coal Corp; 1983-03-02 to current/open; source msha-controller-operator-history