# Relationship history for MSHA mine 0302043

Current hierarchy: **Melinda S  Kemp; James A  Kemp → RIVER VALLEY QUARRIES LLC → RVQ LAVACA**

- 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

- **controller_controls_mine:** Melinda S  Kemp et al → RVQ LAVACA; 2012-10-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** RIVER VALLEY QUARRIES LLC → RVQ LAVACA; 2014-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Melinda S  Kemp et al → RIVER VALLEY QUARRIES LLC; 2014-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A  Kemp et al → RIVER VALLEY QUARRIES LLC; 2014-02-25 to current/open; source msha-controller-operator-history