# Relationship history for MSHA mine 3003924

Current hierarchy: **John H  Dowd; Giesele M  Gagnier → J.J. & G. Sand & Gravel, LLC → J.J. & G. Sand & Gravel, 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** J.J. & G. Sand & Gravel, LLC → J.J. & G. Sand & Gravel, LLC; 2015-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Giesele M  Gagnier et al → J.J. & G. Sand & Gravel, LLC; 2015-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Giesele M  Gagnier et al → J.J. & G. Sand & Gravel, LLC; 2015-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John H  Dowd et al → J.J. & G. Sand & Gravel, LLC; 2015-10-28 to current/open; source msha-controller-operator-history