# Relationship history for MSHA mine 2401719

Current hierarchy: **Marshall Donald E & Ronald Toomer → Pioneer Matrix → State Creek Mine**

- 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:** Johnsrud Ralph A & Ronald Toomer → State Creek Mine; 1981-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R & R Prospectors Inc → State Creek Mine; 1983-05-01 to 1984-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Johnsrud Ralph A & Ronald Toomer → R & R Prospectors Inc; 1983-05-01 to 1984-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Matrix → State Creek Mine; 1984-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marshall Donald E & Ronald Toomer → State Creek Mine; 1984-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marshall Donald E & Ronald Toomer → Pioneer Matrix; 1984-07-01 to current/open; source msha-controller-operator-history