# Relationship history for MSHA mine 0505077

Current hierarchy: **Amanda M Sprague; Matt J Sprague → Sprague Stone LLC → Sprague Stone 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:** Sprague Stone LLC → Sprague Stone LLC; 2015-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Matt J Sprague et al → Sprague Stone LLC; 2015-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matt J Sprague et al → Sprague Stone LLC; 2015-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amanda M Sprague et al → Sprague Stone LLC; 2015-07-01 to current/open; source msha-controller-operator-history