# Relationship history for MSHA mine 2901783

Current hierarchy: **Lincoln County-Nm → Lincoln County Road Department → Ft Stanton Gravel Pit**

- 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

- **operator_operates_mine:** George Graham Gravel → Ft Stanton Gravel Pit; 1979-11-01 to 1980-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Graham George H → Ft Stanton Gravel Pit; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Graham George H → George Graham Gravel; 1979-11-01 to 1980-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Lincoln County Road Department → Ft Stanton Gravel Pit; 1980-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lincoln County-Nm → Ft Stanton Gravel Pit; 1980-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lincoln County-Nm → Lincoln County Road Department; 1980-12-01 to current/open; source msha-controller-operator-history