# Relationship history for MSHA mine 3901501

Current hierarchy: **Vernon E  Stratton → North American Mining Company → Virginia 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

- **operator_operates_mine:** Byron Marteny Mining → Virginia Mine; 2005-02-11 to 2012-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Byron I  Marteny → Virginia Mine; 2005-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Byron I  Marteny → Byron Marteny Mining; 2005-02-11 to 2012-03-13; source msha-controller-operator-history
- **operator_operates_mine:** North American Mining Company → Virginia Mine; 2012-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vernon E  Stratton → Virginia Mine; 2012-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vernon E  Stratton → North American Mining Company; 2012-03-14 to current/open; source msha-controller-operator-history