# Relationship history for MSHA mine 2302494

Current hierarchy: **Riverstone Group → Central Stone Company → LaGrange Sand & Gravel Pit (CS61)**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Riverstone Group → LaGrange Sand & Gravel Pit (CS61); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Central Stone Company → LaGrange Sand & Gravel Pit (CS61); 2015-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riverstone Group → Central Stone Company; 2015-04-01 to current/open; source msha-controller-operator-history