# Relationship history for MSHA mine 1517852

Current hierarchy: **Akers Tony → Akers Coal Inc → Mine No 1**

- 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:** Nicholas  Saylor et al → Mine No 1; 1994-06-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Saylor Brothers Enterprises Inc → Mine No 1; 1996-10-01 to 1999-10-29; source msha-controller-operator-history
- **controller_controls_operator:** Nicholas  Saylor et al → Saylor Brothers Enterprises Inc; 1996-10-01 to 1999-10-29; source msha-controller-operator-history
- **operator_operates_mine:** Akers Coal Inc → Mine No 1; 1999-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Akers Tony → Mine No 1; 1999-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Akers Tony → Akers Coal Inc; 1999-10-30 to current/open; source msha-controller-operator-history