# Relationship history for MSHA mine 2300729

Current hierarchy: **Farmer Mike & Elliott & Mitch Parrish → Washington Sand Company Llc → WASHINGTON SAND CO LLC**

- 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:** Washington Sand Company Inc → WASHINGTON SAND CO LLC; 1950-01-01 to 1996-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Vogt Allen → WASHINGTON SAND CO LLC; 1950-01-01 to 1996-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Vogt Allen → Washington Sand Company Inc; 1950-01-01 to 1996-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Washington Sand Company Llc → WASHINGTON SAND CO LLC; 1997-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Farmer Mike & Elliott & Mitch Parrish → WASHINGTON SAND CO LLC; 1997-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Farmer Mike & Elliott & Mitch Parrish → Washington Sand Company Llc; 1997-01-01 to current/open; source msha-controller-operator-history