# Relationship history for MSHA mine 1517239

Current hierarchy: **Jack  West; Albert A  Arnold → Hclt Inc → Darby-Kellokia**

- 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:** Huddleston J B Et Al → Darby-Kellokia; 1991-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hclt Coal Inc → Darby-Kellokia; 1992-06-01 to 1994-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Huddleston J B Et Al → Hclt Coal Inc; 1992-06-01 to 1994-06-02; source msha-controller-operator-history
- **operator_operates_mine:** Hclt Inc → Darby-Kellokia; 1994-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Albert A  Arnold et al → Darby-Kellokia; 1994-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert A  Arnold et al → Hclt Inc; 1994-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack  West et al → Hclt Inc; 1994-06-03 to current/open; source msha-controller-operator-history