# Relationship history for MSHA mine 0405440

Current hierarchy: **Marvin J  Struiksma → West Coast Rock and Sand → West Coast Rock and Sand**

- 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:** Bud'S & Son Trucking Inc → West Coast Rock and Sand; 2000-06-01 to 2005-12-11; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Willingham → West Coast Rock and Sand; 2000-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Willingham → Bud'S & Son Trucking Inc; 2000-06-01 to 2005-12-11; source msha-controller-operator-history
- **operator_operates_mine:** West Coast Rock and Sand → West Coast Rock and Sand; 2005-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marvin J  Struiksma et al → West Coast Rock and Sand; 2005-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marvin J  Struiksma et al → West Coast Rock and Sand; 2005-12-12 to current/open; source msha-controller-operator-history