# Relationship history for MSHA mine 4606040

Current hierarchy: **Parsons Howard F (Pete) → Thor Inc → Central Dock**

- 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:** Morgantown Ordnance Terminal Inc → Central Dock; 1979-08-01 to 1982-03-15; source msha-controller-operator-history
- **controller_controls_mine:** Underwood Cecil H → Central Dock; 1979-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Underwood Cecil H → Morgantown Ordnance Terminal Inc; 1979-08-01 to 1982-03-15; source msha-controller-operator-history
- **operator_operates_mine:** Best Loading Company Inc → Central Dock; 1982-03-16 to 1986-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Titus Richard L → Central Dock; 1982-03-16 to 1986-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Titus Richard L → Best Loading Company Inc; 1982-03-16 to 1986-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Turner J Preston → Central Dock; 1984-08-01 to 1988-10-03; source msha-controller-operator-history
- **operator_operates_mine:** Middle States Resources Inc → Central Dock; 1986-11-14 to 1988-10-03; source msha-controller-operator-history
- **controller_controls_operator:** Turner J Preston → Middle States Resources Inc; 1986-11-14 to 1988-10-03; source msha-controller-operator-history
- **operator_operates_mine:** Thor Inc → Central Dock; 1988-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Parsons Howard F (Pete) → Central Dock; 1988-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Parsons Howard F (Pete) → Thor Inc; 1988-10-04 to current/open; source msha-controller-operator-history