# Relationship history for MSHA mine 1513204

Current hierarchy: **Whitt Phillip D → T & R Mining Company → #1 Surface**

- 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:** Pack Richard → #1 Surface; 1979-12-01 to 1982-04-18; source msha-controller-operator-history
- **operator_operates_mine:** T & R Mining Company → #1 Surface; 1981-11-01 to 1982-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Pack Richard → T & R Mining Company; 1981-11-01 to 1982-04-18; source msha-controller-operator-history
- **operator_operates_mine:** T & R Mining Company → #1 Surface; 1982-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Whitt Phillip D → #1 Surface; 1982-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Whitt Phillip D → T & R Mining Company; 1982-04-19 to current/open; source msha-controller-operator-history