# Relationship history for MSHA mine 4702893

Current hierarchy: **Aggregate Industries PLC → Camas Minnesota → 4 X 14 WASHPLANT #4**

- 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:** William F  Holst III → 4 X 14 WASHPLANT #4; 1987-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Holst Excavating Inc → 4 X 14 WASHPLANT #4; 1989-09-01 to 2000-03-14; source msha-controller-operator-history
- **controller_controls_operator:** William F  Holst III → Holst Excavating Inc; 1989-09-01 to 2000-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → 4 X 14 WASHPLANT #4; 1995-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Camas Minnesota → 4 X 14 WASHPLANT #4; 2000-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Camas Minnesota; 2000-03-15 to current/open; source msha-controller-operator-history