# Relationship history for MSHA mine 4202718

Current hierarchy: **Jay  Smith → River Basin Contracting → Grantsville Quarry**

- 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:** Robert L  Mendenhall → Grantsville Quarry; 1998-09-11 to 2018-06-02; source msha-controller-operator-history
- **controller_controls_mine:** Jay  Smith et al → Grantsville Quarry; 2018-06-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** River Basin Contracting → Grantsville Quarry; 2020-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jay  Smith et al → River Basin Contracting; 2020-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Mendenhall → River Basin Contracting; 2020-09-02 to 2018-06-02; source msha-controller-operator-history