# Relationship history for MSHA mine 1100124

Current hierarchy: **Riverstone Group → Central Stone Company → Portable Plant #3 (CS50)**

- 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:** Riverstone Group → Portable Plant #3 (CS50); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Central Stone Company → Portable Plant #3 (CS50); 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riverstone Group → Central Stone Company; 1981-06-01 to current/open; source msha-controller-operator-history