# Relationship history for MSHA mine 4406050

Current hierarchy: **Stevens Terry--Edgar Kiser → High Life Coal Company → 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

- **operator_operates_mine:** Poncho & Lefty Coal Corp → Mine No 1; 1984-01-01 to 1985-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Bostic Herman → Mine No 1; 1984-01-01 to 1985-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Bostic Herman → Poncho & Lefty Coal Corp; 1984-01-01 to 1985-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Cannan Coal Company Inc → Mine No 1; 1985-08-23 to 1987-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Harman James E → Mine No 1; 1985-08-23 to 1987-02-23; source msha-controller-operator-history
- **controller_controls_operator:** Harman James E → Cannan Coal Company Inc; 1985-08-23 to 1987-02-23; source msha-controller-operator-history
- **operator_operates_mine:** High Life Coal Company → Mine No 1; 1987-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stevens Terry--Edgar Kiser → Mine No 1; 1987-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stevens Terry--Edgar Kiser → High Life Coal Company; 1987-02-24 to current/open; source msha-controller-operator-history