# Relationship history for MSHA mine 1519139

Current hierarchy: **David L  Denney; Michael W  Denney → Bonnieville Stone LLC → Bonnieville Stone**

- 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:** Bonnieville Stone LLC → Bonnieville Stone; 2007-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David L  Denney  et al → Bonnieville Stone; 2007-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David L  Denney  et al → Bonnieville Stone LLC; 2007-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael W  Denney  et al → Bonnieville Stone LLC; 2007-07-12 to current/open; source msha-controller-operator-history