# Relationship history for MSHA mine 4405460

Current hierarchy: **Smith James E → Smiley Coal Company → 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:** W & L Coal Company → No 1; 1980-08-01 to 1980-11-24; source msha-controller-operator-history
- **controller_controls_mine:** W & L Coal Company → No 1; 1980-08-01 to 1980-11-24; source msha-controller-operator-history
- **controller_controls_operator:** W & L Coal Company → W & L Coal Company; 1980-08-01 to 1980-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Boyd  Keen et al → No 1; 1980-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hickory Coal Company → No 1; 1980-11-25 to 1981-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Boyd  Keen et al → Hickory Coal Company; 1980-11-25 to 1981-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Estel  Crouse et al → Hickory Coal Company; 1980-11-25 to 1981-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Smiley Coal Company → No 1; 1981-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith James E Et Al → No 1; 1981-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith James E Et Al → Smiley Coal Company; 1981-03-02 to current/open; source msha-controller-operator-history