# Relationship history for MSHA mine 4202262

Current hierarchy: **Garaldean  Grundy → GRUNDY CONCRETE → GRUNDY CONCRETE 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:** Grundy Concrete → GRUNDY CONCRETE LLC; 1999-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Douglas  Grundy → GRUNDY CONCRETE LLC; 1999-10-01 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  Grundy → Grundy Concrete; 1999-10-01 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Garaldean  Grundy et al → GRUNDY CONCRETE LLC; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Garaldean  Grundy et al → Grundy Concrete; 2016-01-01 to current/open; source msha-controller-operator-history