# Relationship history for MSHA mine 0404804

Current hierarchy: **Kiewit Infrastructure Group Inc → Kiewit Pacific Co. → California No 1 Portable 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Peter Kiewit Sons' Inc → California No 1 Portable Crusher; 1984-07-01 to 2023-09-18; source msha-controller-operator-history
- **operator_operates_mine:** Kiewit Pacific Co. → California No 1 Portable Crusher; 1986-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter Kiewit Sons' Inc → Kiewit Pacific Co.; 1986-03-01 to 2023-09-18; source msha-controller-operator-history
- **controller_controls_mine:** Kiewit Infrastructure Group Inc → California No 1 Portable Crusher; 2023-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kiewit Infrastructure Group Inc → Kiewit Pacific Co.; 2023-09-19 to current/open; source msha-controller-operator-history