# Relationship history for MSHA mine 0503051

Current hierarchy: **Jeffrey W  Keller; John M  Keller → Alpine Rock Company → ALPINE 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:** Alpine Rock Company → ALPINE PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John M  Keller  et al → ALPINE PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John M  Keller  et al → Alpine Rock Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey W  Keller  et al → Alpine Rock Company; 1950-01-01 to current/open; source msha-controller-operator-history