# Relationship history for MSHA mine 1517850

Current hierarchy: **James B  Newman → Elk Horn Coal Corp → Gunstock 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:** Elk Horn Coal Corp → Gunstock Mine; 1996-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pen Holdings Inc → Gunstock Mine; 1996-10-01 to 2006-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Pen Holdings Inc → Elk Horn Coal Corp; 1996-10-01 to 2006-01-17; source msha-controller-operator-history
- **controller_controls_mine:** James B  Newman → Gunstock Mine; 2006-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James B  Newman → Elk Horn Coal Corp; 2006-01-18 to current/open; source msha-controller-operator-history