# Relationship history for MSHA mine 3610013

Current hierarchy: **Joanne E  Bower → CEDAR ROCK MATERIALS CORPORATION → CEDAR ROCK MATERIALS CORPORATION**

- 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:** CEDAR ROCK MATERIALS CORPORATION → CEDAR ROCK MATERIALS CORPORATION; 2012-07-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Don E  Bower → CEDAR ROCK MATERIALS CORPORATION; 2012-07-05 to 2019-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Don E  Bower → CEDAR ROCK MATERIALS CORPORATION; 2012-07-05 to 2019-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Joanne E  Bower → CEDAR ROCK MATERIALS CORPORATION; 2020-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joanne E  Bower → CEDAR ROCK MATERIALS CORPORATION; 2020-01-01 to current/open; source msha-controller-operator-history