# Relationship history for MSHA mine 3601259

Current hierarchy: **Rogos Ralph T & Ronald → R & R Coal Company → R & R Strip**

- 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:** Smith & Rogos Company → R & R Strip; 1950-01-01 to 1976-01-26; source msha-controller-operator-history
- **controller_controls_mine:** Smith & Rogos Company → R & R Strip; 1950-01-01 to 1976-01-26; source msha-controller-operator-history
- **controller_controls_operator:** Smith & Rogos Company → Smith & Rogos Company; 1950-01-01 to 1976-01-26; source msha-controller-operator-history
- **operator_operates_mine:** R & R Coal Company → R & R Strip; 1976-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rogos Ralph T & Ronald → R & R Strip; 1976-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogos Ralph T & Ronald → R & R Coal Company; 1976-01-27 to current/open; source msha-controller-operator-history