# Relationship history for MSHA mine 3503567

Current hierarchy: **Donald L  Lambert → Indian Rock → Indian Rock**

- 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:** Indian Rock → Indian Rock; 2002-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald L  Lambert → Indian Rock; 2002-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald L  Lambert → Indian Rock; 2002-10-16 to current/open; source msha-controller-operator-history