# Relationship history for MSHA mine 1515351

Current hierarchy: **Ratcliff Terry & Tim → Triple R Mining Company → Triple R Mining Co #1**

- 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:** Triple R Mining Company → Triple R Mining Co #1; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ratcliff Terry & Tim → Triple R Mining Co #1; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ratcliff Terry & Tim → Triple R Mining Company; 1985-09-01 to current/open; source msha-controller-operator-history