# Relationship history for MSHA mine 1517849

Current hierarchy: **Susie A  Smith; Elmer  Fuller → Kyn Coal Company Inc → No 3-K**

- 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:** Susie A  Smith et al → No 3-K; 1979-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Zeigler Coal Holding Company → No 3-K; 1992-11-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Clark Elkhorn Coal Company → No 3-K; 1996-10-01 to 1998-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Zeigler Coal Holding Company → Clark Elkhorn Coal Company; 1996-10-01 to 1998-09-01; source msha-controller-operator-history
- **operator_operates_mine:** Clark Elkhorn Coal Company → No 3-K; 1998-09-02 to 1999-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → No 3-K; 1998-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Clark Elkhorn Coal Company; 1998-09-02 to 1999-04-01; source msha-controller-operator-history
- **operator_operates_mine:** Kyn Coal Company Inc → No 3-K; 1999-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Susie A  Smith et al → Kyn Coal Company Inc; 1999-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elmer  Fuller et al → Kyn Coal Company Inc; 1999-04-02 to current/open; source msha-controller-operator-history