# Relationship history for MSHA mine 0203313

Current hierarchy: **Marvin J  Struiksma → West Coast Sand & Gravel, Inc. → Phoenix**

- 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:** Marvin J  Struiksma et al → Phoenix; 2000-06-19 to 2026-01-26; source msha-controller-operator-history
- **operator_operates_mine:** West Coast Aggregate Supply,Inc → Phoenix; 2013-01-14 to 2013-03-25; source msha-controller-operator-history
- **controller_controls_operator:** Marvin J  Struiksma et al → West Coast Aggregate Supply,Inc; 2013-01-14 to 2013-03-25; source msha-controller-operator-history
- **operator_operates_mine:** West Coast Sand & Gravel, Inc. → Phoenix; 2013-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marvin J  Struiksma et al → Phoenix; 2013-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marvin J  Struiksma et al → West Coast Sand & Gravel, Inc.; 2013-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John R  Struiksma et al → Phoenix; 2026-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Struiksma et al → West Coast Aggregate Supply,Inc; 2026-01-27 to 2013-03-25; source msha-controller-operator-history