# Relationship history for MSHA mine 4101697

Current hierarchy: **Pioneer International Ltd → Pioneer South Central Inc → BLUE ROAN REND**

- 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:** Lone Star Industries Inc → BLUE ROAN REND; 1950-01-01 to 1985-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Lone Star Industries Inc → BLUE ROAN REND; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lone Star Industries Inc → Lone Star Industries Inc; 1950-01-01 to 1985-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer International Ltd → BLUE ROAN REND; 1984-08-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer South Central Inc → BLUE ROAN REND; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer International Ltd → Pioneer South Central Inc; 1985-04-01 to current/open; source msha-controller-operator-history