# Relationship history for MSHA mine 4604785

Current hierarchy: **Underwood Cecil H → Morgantown Ordnance Terminal Inc → Morgantown Ordnance Terminal**

- 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:** Central Dock Company → Morgantown Ordnance Terminal; 1975-10-01 to 1978-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Turner John K → Morgantown Ordnance Terminal; 1975-10-01 to 1978-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Turner John K → Central Dock Company; 1975-10-01 to 1978-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Garbart Paul L → Morgantown Ordnance Terminal; 1978-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Garbart Brothers Inc → Morgantown Ordnance Terminal; 1978-03-14 to 1980-04-13; source msha-controller-operator-history
- **controller_controls_operator:** Garbart Paul L → Garbart Brothers Inc; 1978-03-14 to 1980-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Underwood Cecil H → Morgantown Ordnance Terminal; 1979-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Morgantown Ordnance Terminal Inc → Morgantown Ordnance Terminal; 1980-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Underwood Cecil H → Morgantown Ordnance Terminal Inc; 1980-04-14 to current/open; source msha-controller-operator-history