# Relationship history for MSHA mine 1519417

Current hierarchy: **Michael  McElwain; Robert D  McKnight → B & M Recovery → Cresent Recovery Project**

- 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:** B & M Recovery → Cresent Recovery Project; 2009-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael  McElwain et al → Cresent Recovery Project; 2009-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  McElwain et al → B & M Recovery; 2009-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert D  McKnight et al → B & M Recovery; 2009-07-01 to current/open; source msha-controller-operator-history