# Relationship history for MSHA mine 1300456

Current hierarchy: **Rick L  Kuhlman; Reid E  Kuhlman → Kuhlman Construction Company → Twin Rocks Quarry Or Twin Rocks**

- 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:** Kuhlman Construction Company → Twin Rocks Quarry Or Twin Rocks; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Reid E  Kuhlman et al → Twin Rocks Quarry Or Twin Rocks; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reid E  Kuhlman et al → Kuhlman Construction Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick L  Kuhlman et al → Kuhlman Construction Company; 1950-01-01 to current/open; source msha-controller-operator-history