# Relationship history for MSHA mine 0901172

Current hierarchy: **Zachary  Rountree → Rountree Construction Company → Cow Creek Sand Mine Plant 7**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Bill  Rountree → Cow Creek Sand Mine Plant 7; 2002-12-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rountree Materials, Inc. → Cow Creek Sand Mine Plant 7; 2006-08-15 to 2016-05-26; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Rountree → Rountree Materials, Inc.; 2006-08-15 to 2016-05-26; source msha-controller-operator-history
- **operator_operates_mine:** Rountree Construction Company → Cow Creek Sand Mine Plant 7; 2016-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Zachary  Rountree → Cow Creek Sand Mine Plant 7; 2016-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zachary  Rountree → Rountree Construction Company; 2016-05-27 to current/open; source msha-controller-operator-history