# Relationship history for MSHA mine 4404493

Current hierarchy: **Rasnick Roy L → Micky Coal Company Inc → No 1 Strip**

- 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:** Ramsey Mitchell Jr → No 1 Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ram Coal Company → No 1 Strip; 1976-07-19 to 1977-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Ramsey Mitchell Jr → Ram Coal Company; 1976-07-19 to 1977-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Micky Coal Company Inc → No 1 Strip; 1977-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rasnick Roy L → No 1 Strip; 1977-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rasnick Roy L → Micky Coal Company Inc; 1977-08-18 to current/open; source msha-controller-operator-history