# Relationship history for MSHA mine 1510263

Current hierarchy: **Witten Robert W → Witten Coal & Mining Company Inc → Witten #8 Tipple**

- 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:** Witten Robert W → Witten #8 Tipple; 1975-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Witten Coal & Mining Company Inc → Witten #8 Tipple; 1977-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Witten Robert W → Witten Coal & Mining Company Inc; 1977-03-01 to current/open; source msha-controller-operator-history