# Relationship history for MSHA mine 4502704

Current hierarchy: **Krieg Family LLC → Krieg Construction Inc → Central 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Karl C  Krieg III  et al → Central Pit; 1950-01-01 to 2022-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Christensen Sand & Gravel Company → Central Pit; 1979-01-01 to 1993-05-26; source msha-controller-operator-history
- **controller_controls_mine:** Christensen Sand & Gravel Company → Central Pit; 1979-01-01 to 1993-05-26; source msha-controller-operator-history
- **controller_controls_operator:** Christensen Sand & Gravel Company → Christensen Sand & Gravel Company; 1979-01-01 to 1993-05-26; source msha-controller-operator-history
- **operator_operates_mine:** Krieg Construction Inc → Central Pit; 1993-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Karl C  Krieg III  et al → Krieg Construction Inc; 1993-05-27 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Darlyne A  Krieg et al → Krieg Construction Inc; 1993-05-27 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Krieg Family LLC → Central Pit; 2023-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Krieg Family LLC → Krieg Construction Inc; 2023-01-01 to current/open; source msha-controller-operator-history