# Relationship history for MSHA mine 0504955

Current hierarchy: **Global Recovery One → Broken Arrow Mining → Derr Pit**

- 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:** Broken Arrow Mining → Derr Pit; 2010-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Darwin D  Derr  et al → Derr Pit; 2010-05-11 to 2016-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Darwin D  Derr  et al → Broken Arrow Mining; 2010-05-11 to 2016-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Doug D  Derr et al → Broken Arrow Mining; 2010-05-11 to 2016-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Global Recovery One et al → Derr Pit; 2016-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Global Recovery One et al → Broken Arrow Mining; 2016-01-15 to current/open; source msha-controller-operator-history