# Relationship history for MSHA mine 3102073

Current hierarchy: **Hanson PLC → Nello L Teer Company → Highpoint**

- 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:** Hanson PLC → Highpoint; 1988-11-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nello L Teer Company → Highpoint; 1991-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Nello L Teer Company; 1991-06-01 to current/open; source msha-controller-operator-history