# Relationship history for MSHA mine 0202546

Current hierarchy: **Mark  Adams; Van  Adams → Mineral Park Materials, LLC → Mineral Park Materials, 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Mineral Park Decorative Rock → Mineral Park Materials, LLC; 1991-01-01 to 2008-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Margaret F  Adams → Mineral Park Materials, LLC; 1991-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Margaret F  Adams → Mineral Park Decorative Rock; 1991-01-01 to 2008-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Mineral Park Materials, LLC → Mineral Park Materials, LLC; 2008-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Adams et al → Mineral Park Materials, LLC; 2008-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Adams et al → Mineral Park Materials, LLC; 2008-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Van  Adams et al → Mineral Park Materials, LLC; 2008-06-01 to current/open; source msha-controller-operator-history