# Relationship history for MSHA mine 2501239

Current hierarchy: **Debra K  Maris; Gerald L  Maris → Maris General Construction LLC → MGC Sand & Gravel**

- 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:** Maris General Construction LLC → MGC Sand & Gravel; 2008-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gerald L  Maris et al → MGC Sand & Gravel; 2008-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gerald L  Maris et al → Maris General Construction LLC; 2008-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Debra K  Maris et al → Maris General Construction LLC; 2008-03-10 to current/open; source msha-controller-operator-history