# Relationship history for MSHA mine 4608929

Current hierarchy: **Douglas M  Epling → MOUNTAIN EDGE MINING, INC. → MOUNTAIN EDGE HIGHWALL #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Douglas M  Epling → MOUNTAIN EDGE HIGHWALL #1; 1994-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Contour Mining Corporation → MOUNTAIN EDGE HIGHWALL #1; 2001-10-19 to 2001-12-12; source msha-controller-operator-history
- **controller_controls_mine:** James S  Ferguson et al → MOUNTAIN EDGE HIGHWALL #1; 2001-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James S  Ferguson et al → Contour Mining Corporation; 2001-10-19 to 2001-12-12; source msha-controller-operator-history
- **controller_controls_operator:** R Bruce  Ferguson et al → Contour Mining Corporation; 2001-10-19 to 2001-12-12; source msha-controller-operator-history
- **operator_operates_mine:** MOUNTAIN EDGE MINING, INC. → MOUNTAIN EDGE HIGHWALL #1; 2001-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas M  Epling → MOUNTAIN EDGE MINING, INC.; 2001-12-13 to current/open; source msha-controller-operator-history