# Relationship history for MSHA mine 2103453

Current hierarchy: **Kurt  Krippner; Kevin  Krippner → Krippner Trucking and Excavating → Krippner Trucking and Excavating**

- 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:** Richmond River Rock → Krippner Trucking and Excavating; 2004-07-07 to 2024-05-21; source msha-controller-operator-history
- **controller_controls_mine:** Ralph W  Gertken → Krippner Trucking and Excavating; 2004-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph W  Gertken → Richmond River Rock; 2004-07-07 to 2024-05-21; source msha-controller-operator-history
- **operator_operates_mine:** Krippner Trucking and Excavating → Krippner Trucking and Excavating; 2024-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin  Krippner et al → Krippner Trucking and Excavating; 2024-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Krippner et al → Krippner Trucking and Excavating; 2024-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kurt  Krippner et al → Krippner Trucking and Excavating; 2024-05-22 to current/open; source msha-controller-operator-history