# Relationship history for MSHA mine 3303930

Current hierarchy: **Westmoreland Coal Company → Oxford Mining Co,LLC → Lisbon Mine**

- 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:** Charles C  Ungurean → Lisbon Mine; 1950-01-01 to 2014-12-31; source msha-controller-operator-history
- **operator_operates_mine:** C & E Coal Inc → Lisbon Mine; 1983-02-01 to 2004-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Amos  Rawson → Lisbon Mine; 1983-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amos  Rawson → C & E Coal Inc; 1983-02-01 to 2004-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Oxford Mining Co,LLC → Lisbon Mine; 2004-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles C  Ungurean → Oxford Mining Co,LLC; 2004-04-07 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Coal Company → Lisbon Mine; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Oxford Mining Co,LLC; 2015-01-01 to current/open; source msha-controller-operator-history