# Relationship history for MSHA mine 1516514

Current hierarchy: **Quesenberry Lloyd → Erico Processing Inc → No 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Erico Processing Inc → No 1 Surface; 1988-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Quesenberry Lloyd → No 1 Surface; 1988-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quesenberry Lloyd → Erico Processing Inc; 1988-11-01 to current/open; source msha-controller-operator-history