# Relationship history for MSHA mine 4400288

Current hierarchy: **Stephen D  Halsey; Carl A  Hamilton → Minutemen Coal Company Inc → 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

- **operator_operates_mine:** Steels Fork Mining Company → No 3; 1950-01-01 to 1982-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Powers Edward → No 3; 1950-01-01 to 1982-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Powers Edward → Steels Fork Mining Company; 1950-01-01 to 1982-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Stephen D  Halsey et al → No 3; 1980-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Minutemen Coal Company Inc → No 3; 1982-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen D  Halsey et al → Minutemen Coal Company Inc; 1982-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl A  Hamilton et al → Minutemen Coal Company Inc; 1982-06-15 to current/open; source msha-controller-operator-history