# Relationship history for MSHA mine 1800653

Current hierarchy: **Barnett Lee C → Hi Note Inc → Pond Hill**

- 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:** Hi Note Inc → Pond Hill; 1978-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barnett Lee C → Pond Hill; 1978-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barnett Lee C → Hi Note Inc; 1978-01-01 to current/open; source msha-controller-operator-history