# Relationship history for MSHA mine 4503590

Current hierarchy: **Roland L  Chipman → Apple Valley Sand & Gravel → Rocky Reach**

- 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:** Chipman Construction Inc. → Rocky Reach; 2005-11-01 to 2009-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Roland L  Chipman → Rocky Reach; 2005-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roland L  Chipman → Chipman Construction Inc.; 2005-11-01 to 2009-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Apple Valley Sand & Gravel → Rocky Reach; 2009-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roland L  Chipman → Rocky Reach; 2009-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roland L  Chipman → Apple Valley Sand & Gravel; 2009-06-15 to current/open; source msha-controller-operator-history