# Relationship history for MSHA mine 1512799

Current hierarchy: **Buddeke Paul E & Richard L → Sixway Company → Wash Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Sixway Company → Wash Plant; 1981-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Buddeke Paul E & Richard L Et Al → Wash Plant; 1981-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buddeke Paul E & Richard L Et Al → Sixway Company; 1981-03-01 to current/open; source msha-controller-operator-history