# Relationship history for MSHA mine 5001807

Current hierarchy: **Manson Construction Company; Kiewit Infrastructure West Co → Kiewit Manson, a JV → Rock Alaska Quarry**

- 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

- **operator_operates_mine:** Kiewit Manson, a JV → Rock Alaska Quarry; 2019-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kiewit Infrastructure West Co et al → Rock Alaska Quarry; 2019-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kiewit Infrastructure West Co et al → Kiewit Manson, a JV; 2019-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Manson Construction Company et al → Kiewit Manson, a JV; 2019-05-08 to current/open; source msha-controller-operator-history