# Relationship history for MSHA mine 3500798

Current hierarchy: **Scott T  Parker → Columbia County Crushing LLC → Tide Creek Rock**

- 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:** Scappoose Sand & Gravel Company → Tide Creek Rock; 1950-01-01 to 2020-07-13; source msha-controller-operator-history
- **controller_controls_mine:** Scott T  Parker → Tide Creek Rock; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott T  Parker → Scappoose Sand & Gravel Company; 1950-01-01 to 2020-07-13; source msha-controller-operator-history
- **operator_operates_mine:** Columbia County Crushing LLC → Tide Creek Rock; 2020-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott T  Parker → Tide Creek Rock; 2020-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott T  Parker → Columbia County Crushing LLC; 2020-07-14 to current/open; source msha-controller-operator-history