# Relationship history for MSHA mine 3200989

Current hierarchy: **Deborah  Lamb → Lamb Rock → ND 1**

- 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:** Lamb Rock → ND 1; 2012-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Deborah  Lamb → ND 1; 2012-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deborah  Lamb → Lamb Rock; 2012-08-13 to current/open; source msha-controller-operator-history