# Relationship history for MSHA mine 1201451

Current hierarchy: **RR Holdco, Inc. → Rieth-Riley Construction Company Inc → Charlottesville Sand And Gravel**

- 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

- **controller_controls_mine:** Rieth-Riley Construction Company Inc → Charlottesville Sand And Gravel; 1950-01-01 to 2025-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Caldwell Gravel Sales Inc → Charlottesville Sand And Gravel; 1950-01-01 to 1981-06-18; source msha-controller-operator-history
- **controller_controls_mine:** Dana I  Caldwell → Charlottesville Sand And Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dana I  Caldwell → Caldwell Gravel Sales Inc; 1950-01-01 to 1981-06-18; source msha-controller-operator-history
- **operator_operates_mine:** Rieth-Riley Construction Company Inc → Charlottesville Sand And Gravel; 1981-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rieth-Riley Construction Company Inc → Rieth-Riley Construction Company Inc; 1981-06-19 to 2025-01-30; source msha-controller-operator-history
- **controller_controls_mine:** RR Holdco, Inc. → Charlottesville Sand And Gravel; 2025-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** RR Holdco, Inc. → Rieth-Riley Construction Company Inc; 2025-01-31 to current/open; source msha-controller-operator-history