# Relationship history for MSHA mine 1513221

Current hierarchy: **Hall David G → Legacy Coal Company Inc → 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:** Howes Clayton → No 1; 1980-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Howes Coal Company Inc → No 1; 1981-11-01 to 1982-10-13; source msha-controller-operator-history
- **controller_controls_operator:** Howes Clayton → Howes Coal Company Inc; 1981-11-01 to 1982-10-13; source msha-controller-operator-history
- **operator_operates_mine:** Midway Coal Company Inc → No 1; 1982-10-14 to 1986-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Ratliff Frank → No 1; 1982-10-14 to 1986-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff Frank → Midway Coal Company Inc; 1982-10-14 to 1986-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Legacy Coal Company Inc → No 1; 1986-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hall David G → No 1; 1986-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall David G → Legacy Coal Company Inc; 1986-01-22 to current/open; source msha-controller-operator-history