# Relationship history for MSHA mine 3607859

Current hierarchy: **Richard  Hubler; Jack R  Miller Jr → West End Coal Company → Last Chance Slope**

- 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:** West End Coal Company → Last Chance Slope; 1987-02-01 to 1994-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey R  Harner et al → Last Chance Slope; 1987-02-01 to 1994-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey R  Harner et al → West End Coal Company; 1987-02-01 to 1994-02-01; source msha-controller-operator-history
- **operator_operates_mine:** West End Coal Company → Last Chance Slope; 1994-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jack R  Miller Jr et al → Last Chance Slope; 1994-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack R  Miller Jr et al → West End Coal Company; 1994-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Hubler  et al → West End Coal Company; 1994-02-02 to current/open; source msha-controller-operator-history