# Relationship history for MSHA mine 2902066

Current hierarchy: **Douglas E  Hanson → Steeple Rock Mining Company → East Camp Mine**

- 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:** Steeple Rock Mining Company → East Camp Mine; 1990-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Douglas E  Hanson → East Camp Mine; 1990-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas E  Hanson → Steeple Rock Mining Company; 1990-11-01 to current/open; source msha-controller-operator-history