# Relationship history for MSHA mine 1201880

Current hierarchy: **Sandage James → Eagle Rock Mining Inc → Dauby No 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:** Eagle Rock Mining Inc → Dauby No 1; 1982-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sandage James → Dauby No 1; 1982-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sandage James → Eagle Rock Mining Inc; 1982-02-01 to current/open; source msha-controller-operator-history