# Relationship history for MSHA mine 0400081

Current hierarchy: **Knife River Corporation → Connolly-Pacific Company → PEBBLY BEACH 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:** Connolly-Pacific Company → PEBBLY BEACH QUARRY; 1950-01-01 to 2000-04-30; source msha-controller-operator-history
- **controller_controls_mine:** L G Everist Inc → PEBBLY BEACH QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** L G Everist Inc → Connolly-Pacific Company; 1950-01-01 to 2000-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Connolly-Pacific Company → PEBBLY BEACH QUARRY; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → PEBBLY BEACH QUARRY; 2000-05-01 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Connolly-Pacific Company; 2000-05-01 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → PEBBLY BEACH QUARRY; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Connolly-Pacific Company; 2023-06-01 to current/open; source msha-controller-operator-history