# Relationship history for MSHA mine 4503777

Current hierarchy: **Steve  Olson; Mike  Olson → Mountain Stone Aggregate → Johnson Creek 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

- **controller_controls_mine:** Rusty  Gill → Johnson Creek Quarry; 2012-06-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** RG Crushing, Inc. → Johnson Creek Quarry; 2018-01-17 to 2019-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Rusty  Gill → RG Crushing, Inc.; 2018-01-17 to 2019-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Stone Aggregate → Johnson Creek Quarry; 2019-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Olson et al → Johnson Creek Quarry; 2019-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Olson et al → Mountain Stone Aggregate; 2019-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Olson et al → Mountain Stone Aggregate; 2019-06-01 to current/open; source msha-controller-operator-history