# Relationship history for MSHA mine 1517702

Current hierarchy: **Ricky  Blair → Blair Coal Company Inc → Elkhorn No 3**

- 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:** (Donald) Todd  Kiscaden et al → Elkhorn No 3; 1989-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin  Hampton → Elkhorn No 3; 1990-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kiah Creek Mining Company → Elkhorn No 3; 1995-08-01 to 1996-03-18; source msha-controller-operator-history
- **controller_controls_operator:** (Donald) Todd  Kiscaden et al → Kiah Creek Mining Company; 1995-08-01 to 1996-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Kiscaden et al → Kiah Creek Mining Company; 1995-08-01 to 1996-03-18; source msha-controller-operator-history
- **operator_operates_mine:** Crager Fork Mining Inc → Elkhorn No 3; 1996-03-19 to 1997-01-27; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin  Hampton → Crager Fork Mining Inc; 1996-03-19 to 1997-01-27; source msha-controller-operator-history
- **operator_operates_mine:** Blair Coal Company Inc → Elkhorn No 3; 1997-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ricky  Blair → Elkhorn No 3; 1997-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ricky  Blair → Blair Coal Company Inc; 1997-01-28 to current/open; source msha-controller-operator-history