# Relationship history for MSHA mine 1512521

Current hierarchy: **Newsome Wayne → Ligon Preparation Company → Melvin 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

- **operator_operates_mine:** Ligon Preparation Company → Melvin Tipple; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Newsome Wayne → Melvin Tipple; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Newsome Wayne → Ligon Preparation Company; 1980-09-01 to current/open; source msha-controller-operator-history