# Relationship history for MSHA mine 2402295

Current hierarchy: **Donald  Beer; Andrea  Beer → Stillwater Excavating → Beartooth Pit**

- 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

- **operator_operates_mine:** Riverside Gravel & Trucking → Beartooth Pit; 2002-08-01 to 2018-03-11; source msha-controller-operator-history
- **controller_controls_mine:** Ron  Olson  et al → Beartooth Pit; 2002-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Olson  et al → Riverside Gravel & Trucking; 2002-08-01 to 2018-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Gina  Olson  et al → Riverside Gravel & Trucking; 2002-08-01 to 2018-03-11; source msha-controller-operator-history
- **operator_operates_mine:** Stillwater Excavating → Beartooth Pit; 2018-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Beer et al → Beartooth Pit; 2018-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Beer et al → Stillwater Excavating; 2018-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrea  Beer et al → Stillwater Excavating; 2018-03-12 to current/open; source msha-controller-operator-history