# Relationship history for MSHA mine 4201573

Current hierarchy: **Davies Ernest A → Rocky Pass Mines Ltd → Rocky Pass Mines Ltd**

- 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:** Box Cedar Mining Inc → Rocky Pass Mines Ltd; 1979-01-01 to 1980-05-18; source msha-controller-operator-history
- **controller_controls_mine:** Mc Dermitt Andrew → Rocky Pass Mines Ltd; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Dermitt Andrew → Box Cedar Mining Inc; 1979-01-01 to 1980-05-18; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Pass Mines Ltd → Rocky Pass Mines Ltd; 1980-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Davies Ernest A → Rocky Pass Mines Ltd; 1980-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davies Ernest A → Rocky Pass Mines Ltd; 1980-05-19 to current/open; source msha-controller-operator-history