# Relationship history for MSHA mine 0504589

Current hierarchy: **Amy  Brooks; Ralph  Bell → Castle Rock Construction Company of Colorado, LLC → Cedar Rapids L J - TS**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Castle Rock Construction Company → Cedar Rapids L J - TS; 1997-01-01 to 2019-11-18; source msha-controller-operator-history
- **controller_controls_mine:** Colin  Jensen → Cedar Rapids L J - TS; 1997-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colin  Jensen → Castle Rock Construction Company; 1997-01-01 to 2019-11-18; source msha-controller-operator-history
- **operator_operates_mine:** Castle Rock Construction Company of Colorado, LLC → Cedar Rapids L J - TS; 2019-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ralph  Bell et al → Cedar Rapids L J - TS; 2019-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph  Bell et al → Castle Rock Construction Company of Colorado, LLC; 2019-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amy  Brooks et al → Castle Rock Construction Company of Colorado, LLC; 2019-11-19 to current/open; source msha-controller-operator-history