# Relationship history for MSHA mine 4703275

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

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** St Joseph Construction Company Inc → Krippner Trucking and Exc Cone crusher; 2001-05-01 to 2024-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Schams → Krippner Trucking and Exc Cone crusher; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Schams → St Joseph Construction Company Inc; 2001-05-01 to 2024-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Kurt  Krippner et al → Krippner Trucking and Exc Cone crusher; 2024-05-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Krippner Trucking and Excavating → Krippner Trucking and Exc Cone crusher; 2024-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kurt  Krippner et al → Krippner Trucking and Excavating; 2024-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Krippner et al → Krippner Trucking and Excavating; 2024-06-14 to current/open; source msha-controller-operator-history