# Relationship history for MSHA mine 0504839

Current hierarchy: **Jeff  Kellogg → Tug Hill Construction, Inc. → MPRC 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:** Tug Hill Construction, Inc. → MPRC Pit; 2006-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeff  Kellogg → MPRC Pit; 2006-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Kellogg → Tug Hill Construction, Inc.; 2006-02-06 to current/open; source msha-controller-operator-history