# Relationship history for MSHA mine 0505160

Current hierarchy: **Amy  Brooks; Ralph  Bell → Castle Rock Construction Company of Colorado LLC → METSO1213S**

- 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

- **controller_controls_mine:** Ralph  Bell et al → METSO1213S; 2019-11-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Castle Rock Construction Company of Colorado LLC → METSO1213S; 2023-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph  Bell et al → Castle Rock Construction Company of Colorado LLC; 2023-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amy  Brooks et al → Castle Rock Construction Company of Colorado LLC; 2023-01-16 to current/open; source msha-controller-operator-history